Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcd075e0d0ec11e…

MALICIOUS

PDF

89.2 KB Created: 2021-06-25 16:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1cdf6a0b1b99a5c6ffd7aa71d21b9cf0 SHA-1: c49bb11760bf6b0714075812627f22017a92ca10 SHA-256: 4dcd075e0d0ec11effba1ac661fa6203a5456d4afba2dd1612c96462321697f2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as a malicious PDF by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links, many pointing to disposable hosting or compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, but the heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates a fraudulent scheme involving prizes or parcels.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://hurtmar.pl/Upload/file/85151532643.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73145abd4---vedetili.pdf
    • https://people11people.gr/uploads/File/perunazegofopuf.pdf
    • https://netshopnepal.com/userfiles/file/rutabux.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9c931d76b---9037128856.pdf
    • http://schokozentrale.de/idata/lisonukejir.pdf
    • http://119hero.kr/userData/board/file/kelenivosufur.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160745f8d2bc0a---68410820812.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/2be276ea605c9c712d6eee142ab5a0fc/setikubakiduxatijamow.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae3993d1b---55690593847.pdf
    • http://gazosilikatnn.ru/uploads/files/66173791262.pdf
    • http://vmkmsz.hu/userfiles/file/81226047985.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084ea3078457---17002162548.pdf
    • https://gea99.com/ckfinder/userfiles/files/gekogofeterulonuxel.pdf
    • http://www.ecvbrass.ch/user/web/file/nosavisirubi.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/53633223969.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/f6b2c866ed156ecd4ab8487e50673e0d/muxotifusedop.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=employee+availability+form+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb7b.bin
7299768d3a3a410d0d4827f73f25241240a6707002369dd293c01c2be4b97b72
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 10688 bytes
font_01_sfnt_off000113c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 16792 bytes
font_02_sfnt_off00012bd3.bin
2c236493f231354f23c4a5ffa67993bf7ca7ebf11d3007e4166dff14d3586940
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD3 16840 bytes