PDF malware analysis — malicious · aad5e52472e554c6

MALICIOUS

PDF

91.7 KB Created: 2021-07-04 20:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 5f407a3c1eb02c070e0535aaf265ee57 SHA-1: f36f18eb1f2fea7b6025ed43a6d115d9e9b45747 SHA-256: aad5e52472e554c66324e521973e4b05cea1debd9c2a3ed6451d8d3255622734

192 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites, suggesting an attempt to deliver a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a download button lure further supports a malicious workflow.

Machine Learning

Nyx PDF Classifier malicious score 0.9746

Heuristics 9

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://photo-preiss.com/upload_files/files/63939714681.pdf In PDF document text
- https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160740dd275820---81111562167.pdfIn PDF document text
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/63f95b4fbbdffee8e1c5b53670c90e78/bopogap.pdfIn PDF document text
- https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/fb9a818015089c0f464b81e249df1318/56934926284.pdfIn PDF document text
- https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/68nga71l0nju2od3m8tc6sqm72/liwid.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23c0e844c4---32913279620.pdfIn PDF document text
- http://dentherapia.hu/files/file/38414180939.pdfIn PDF document text
- http://docando.es/js/ckfinder/userfiles/files/68632640274.pdfIn PDF document text
- http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609164b03e54f---35934988986.pdfIn PDF document text
- https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9959336f319a8a3b5e085e5fc9e54866/43572710054.pdfIn PDF document text
- http://romanakladatelstvi.cz/userfiles/file/nusinigiridutuluzimo.pdfIn PDF document text
- http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd29e11576---ganatadavobivogopeli.pdfIn PDF document text
- https://detectiveoffice.net/userfiles/file/36879541399.pdfIn PDF document text
- https://premium-house.uz/images/file/zolawimamupap.pdfIn PDF document text
- https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/1e1d1a153e36227f4e9c8f168a9a7ef1/xubipawexulututuvujeb.pdfIn PDF document text
- http://indago-rovigo.it/userfiles/files/radibigasovomoxotuwiwanag.pdfIn PDF document text
- http://ssaisarang.com/ckfinder/userfiles/files/85986228720.pdfIn PDF document text
- https://llsindia.in/FCKeditor/file/72758120354.pdfIn PDF document text
- http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609856101d835---lodoripesod.pdfIn PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851509f2310---filedi.pdfIn PDF document text
- https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/71e3dec971367d378137715f9f0f3d50/xekulibuviririj.pdfIn PDF document text
- https://biorenta.lt/ckfinder/userfiles/files/zedokolufapawifajujejupe.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160beda4fd9283---pefuxepuriluvoribi.pdfIn PDF document text
- https://radmangroup-ye.com/rgfiles/file/13098735600.pdfIn PDF document text
- https://avgdesign.com/userfiles/file/fajurojamizapakav.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3d73dedc1---fogolefonibi.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866937e71b3---kikutilal.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=simplification+questions+for+class+6+pdf+downloadPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e6c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6C7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fed8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFED8	16076 bytes
SHA-256: `0491ab1f9781984131449868ed95f15036bddabad70a51597ae233fa8bdf08d0`
`font_02_sfnt_off00011400.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11400	11356 bytes
SHA-256: `3382b28aaf317497e8ad3dca739cc41ffac02be8259ea461a1d5d5635a336106`
`font_03_sfnt_off00012e90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E90	18064 bytes
SHA-256: `3476ffcff23ac50bbb95b57fa7707fbeb0d1d959d416e4d5965b2f2522150071`

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