PDF malware analysis — malicious · ca3018dfc9e70491

MALICIOUS

PDF

98.0 KB Created: 2021-08-15 06:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: a838cf928c51d7af85b1cb47b2d89862 SHA-1: 691f7581bcea09fade07d5f931d01ed4cdaa3eb3 SHA-256: ca3018dfc9e7049144dc33e411d591d227e3ab5bce02b20f428dcfe43fd4d781

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the primary attack pattern involves directing users to external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9900

Heuristics 6

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.
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://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7a8e485d---xabopezirefomaju.pdf In PDF document text
- http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/852742003.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915573c58d0---tanipavemufesa.pdfIn PDF document text
- http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e54e266cf---limemo.pdfIn PDF document text
- http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/46099084665.pdfIn PDF document text
- http://antansconstructions.com/ckfinder/userfiles/files/15657849348.pdfIn PDF document text
- http://caopump.com/admin/userfiles/file/laxag.pdfIn PDF document text
- http://thuocamakong.net/userfiles/image/file/japolokesojafigutu.pdfIn PDF document text
- https://ipic.vn/userfiles/file/nusiwagemuxufipajizu.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/vavuri.pdfIn PDF document text
- https://listapp.in/ci/userfiles/files/28990288254.pdfIn PDF document text
- http://abwlargo.com/uploads/files/33323052343.pdfIn PDF document text
- http://superfishinglewood.com/uploads/files/55767637681.pdfIn PDF document text
- https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092d1bc62069---5155510177.pdfIn PDF document text
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c7f9da62e684c6b7e614f68744d582cd/ximetamumimutovedujox.pdfIn PDF document text
- http://niezapominajkowo.eu/userfiles/file/sorilukopoxureto.pdfIn PDF document text
- http://masterref.ru/editorfiles/file/pefabafiv.pdfIn PDF document text
- https://groupunsur1.com/contents//files/tojijofidu.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/052488bd40c122b58ae0b952a27cda85/6070278938.pdfIn PDF document text
- https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/81518e1e9799cf966dedffffb16d1f39/20513284208.pdfIn PDF document text
- http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/xejonanuxotufimumulefefef.pdfIn PDF document text
- http://tizianaiberti.it/userfiles/files/wulesetokop.pdfIn PDF document text
- http://ggmtc.net/userfiles/files/vufojel.pdfIn PDF document text
- http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c653e0914f---43784991196.pdfIn PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/4a3a5316b44327677355c1de703d1e10/47375811542.pdfIn PDF document text
- https://bandai-k.com/userfiles/file/67096024612.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+make+an+easy+xp+farm+in+minecraft+pePDF 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_off000102e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102E6	17464 bytes
SHA-256: `d847316587c5c131ef7ebc7aa7413918516c54bbcbc1eabc50181a03bd2709d6`
`font_01_sfnt_off000130df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130DF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000148f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x148F6	10980 bytes
SHA-256: `cbbf2fa95dda64e59ec8e8684c030a6cc4b85b3052b64866ed6bb857aa443cf4`
`font_03_sfnt_off00016287.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16287	16208 bytes
SHA-256: `4602efdc27effd6d0b9796dd62a14020f6514d216ceac1da6ee579af8a0da4e5`

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