Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c35f4d7dbca849…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 06:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a33bc70dd95a9a9206c28d7aa007a90 SHA-1: 53797ebf5839acbdb4cccc5d84b47d8b0b7ee3ae SHA-256: b6c35f4d7dbca849c46b5445d49aa6b63e1994acb3ebec9dcc55eb0df90c4ed8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to disposable hosting and compromised CMS upload directories. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to phishing or malware sites, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://4998horo.gmmwireless.com/contents/files/44951432344.pdf In PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8349ba19c2---vadakuxinul.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t4kkk29enojrtup2fo53o3o3u0/75424859631.pdfIn PDF document text
    • http://short-story.ru/upload/file/dagasorili.pdfIn PDF document text
    • http://hifi-markt.org/kunden/kronhardt/ckfinder/userfiles/files/97832078454.pdfIn PDF document text
    • http://tochuchoinghi.org/files/zakesopawerobusoduli.pdfIn PDF document text
    • http://imi.vc/upload/files/monibonezigorajabazad.pdfIn PDF document text
    • http://rideco.hu/upload/file/zurugevejonavoxeb.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/tobokugunezajapajapifafe.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b6b60013638ff249b13bf4d1a54f342/gefutupevida.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/jezilipugeko.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/belotisolore.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090404501369.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/86957028730.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/foboxusoretot.pdfIn PDF document text
    • http://keramann.ru/uploads/files/sivudejitewuvof.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/26023827014.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/dotavitavur.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/16925572492.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/80712307271.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8214d98ad---78670908278.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/30306722708.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/3941420613.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/30888943951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+organize+pdf+files+in+an+ipadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38E 17704 bytes
SHA-256: 0363d1d0834d06fc359a46c8b84d84d97a10fc216a6b443e680315448badbb37
font_01_sfnt_off0001013f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013F 10812 bytes
SHA-256: 135a53b41f9050daad49fbdb0a006774920da4b312e87f28f74e9dd6d600ccb4
font_02_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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