PDF malware analysis — malicious · f812f813aa12eca5

MALICIOUS

PDF

82.7 KB Created: 2021-09-23 06:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 5027773d27f3617eea18ed3ff6ec15c8 SHA-1: 280f537b66079fcf3be67e40ca049474e72d9258 SHA-256: f812f813aa12eca562376e55f4b1def7fcd9e6ac2533bddaad009c5d6ef8e19a

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports the phishing and malware distribution intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

Heuristics 7

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.
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 https://cructi.ru/uplcv?utm_term=twilight+eclipse+full+movie+with+english+subtitles+123movies PDF link annotation
- http://alpha-th.com/userfiles/file/zenofe.pdfIn PDF document text
- https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137a45326592---41418362836.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f664f287ce---63730869830.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16148f878f243c---6232376387.pdfIn PDF document text
- http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142409b71986---49665900118.pdfIn PDF document text
- https://el-tall.pl/pics/file/94994803955.pdfIn PDF document text
- http://jgbt.us/pds/userfiles/files/8031487930.pdfIn PDF document text
- http://theeultimatenetworker.com/ckfinder/userfiles/files/lufatixusanatizebosi.pdfIn PDF document text
- http://kimyasaldubeller.com/upload/ckfinder/files/laverexujoferekenufopafok.pdfIn PDF document text
- http://zamdq.com/filespath/files/20210916065604.pdfIn PDF document text
- http://american-security-inc.com/assets/ckfinder/userfiles/files/maposekidupume.pdfIn PDF document text
- https://xanbiente.de/userfiles/file/1489344847.pdfIn PDF document text
- http://openendrep.com/userfiles/files/54161619334.pdfIn PDF document text
- http://hoteldanang.vn/uploads/images/files/71484166483.pdfIn PDF document text
- https://safe-international.com/userfiles/file/fukalax.pdfIn PDF document text
- https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/r5erplkd4ha7nvnp1cdnbec2eq/fapeduvekoxogerura.pdfIn PDF document text
- http://chayka-svg.ru/files/94854527934.pdfIn PDF document text
- http://csc0731.com/userfiles/file/20210911102914_iiv9zy.pdfIn PDF document text
- http://ginzaramen.us/uploads/files/fimatibazogurorujidoj.pdfIn PDF document text
- http://kristiankutschera.de/userfiles/file/sovilogoxonizuzixanow.pdfIn PDF document text
- http://icltindia.in/userfiles/file/15657060506.pdfIn PDF document text
- https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a9fbc4f9489f7ce243ff6697a2702ca3/5448659560.pdfIn PDF document text
- 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d852.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD852	18760 bytes
SHA-256: `48bb69bc61b8ec998a272df10b440344e07982a51a2a9ec6a76cb7e6ebe21872`
`font_01_sfnt_off000109f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109F8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001220f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1220F	11364 bytes
SHA-256: `fb8db8fc45e46f710ccf573403e9a2bf3fe27a5c9ade51a8caa2ea1456bbd802`

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