Malicious PDF — malware analysis report

Static analysis result for SHA-256 3870f632731cf151…

MALICIOUS

PDF

74.9 KB Created: 2021-05-05 15:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6086f7a792b5d673b6f8afe348fffaa2 SHA-1: 1aa368cc0c4861e6af7c39450d36bc742bc30d3d SHA-256: 3870f632731cf151185a5d82422b7d9f599f47bf9fd0a511714aeeaffb9aaf95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links and the 'link farm' heuristic suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d352568b4---wemod.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076a0087b6db---62190454418.pdf
    • http://activesolutionelectric.com/images/file/60144074105.pdf
    • http://originalcheck.it/public/img_admin/file/%5C/53986786360.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088ef3b0f88f---26742722450.pdf
    • http://anhbanglaw.com/userfiles/file/24774564520.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fncqcj8ct8abickqm6a3sgt9j4/numafivi.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2fed22878105cd6bc546ba95c9f228f5/60433648226.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/519d68b1e344fd4f35986afc3ac69722/jawupokixexagav.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080d942f1148---24696060856.pdf
    • http://www.allatpatikapecs.hu/images/file/44602738991.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/euqe6hmkl60ips7a320oavob02/waperemapuzorofizazupeta.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071128c9c9a0---48137666981.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8fi9lh9f9n20k3l79q133gqklb/45001246103.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/8pet6r60g25c4igd3e4egn9t0b/ludofonodiralevomudopu.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5dcf2f0e509787bd7225a30b955fd8ec/84295413298.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=amu+admission+form+2018+class+11
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93a.bin
d15fe41d6a8349075f2342508a6447e38c1f18040d044370f07370f78b70cd9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 5676 bytes
font_01_sfnt_off0000ec72.bin
de8278cf47626c242e39f8f1681ef599510241d476aa094221aae3456647c5fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 4872 bytes
font_02_sfnt_off0000f9dd.bin
3cc4bd7c10fbd48e919987bc21860e1c4a05cd9827530aefb4ed54c69f546359		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 10592 bytes
font_03_sfnt_off00011e0f.bin
06e0ffd2b728d32f4f48ea6e9c6bde12e2fbb6788376ac7b90032c58ed8fcaaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0F 2708 bytes

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