Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9793909d42fa9d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 09:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6337412f48e9556b24f6cd7b582c4ac2 SHA-1: 477bdfc7a19b1df5ab44eee436c6332af7b0e20f SHA-256: cd9793909d42fa9dbdde1861f9e0fd58a140a6096e86ac0db29d6e7c826c2cad
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vodova51-53.cz/files/95096473481.pdf In PDF document text
    • http://muntepa.com/userfiles/files/67745020004.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/kakojisunoxiri.pdfIn PDF document text
    • http://186086.com/upload/files/mizivoluwokezexigab.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ohk6gaklg2esnjf9fnc5u97n0/xisimi.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/vumabituwalobajum.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/58639940652.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/11094244376.pdfIn PDF document text
    • https://aedwea.com/upload/foto/79520538363.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/12231360188.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/13452803231.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/49908904774.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/472177948611877bb91aa2.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a79f784d0c---43313384020.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/17f867ba3d61ee654853e201a92c1ce7/basetukagufagilobes.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/79311427954.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160871edf52b93---92268543765.pdfIn PDF document text
    • http://ud2-140.com/files/97396664220.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/f76b9538c3e35520031c9f91831361ed/fupawetirimupo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1b0cdee4becbb390f621ffdff5954e0c/34344863908.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/68768768415.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c16b69eb70a---wutetadif.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/rejozotubefani.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/87643035937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=decoding+cvc+words+worksheetsPDF 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_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 18132 bytes
SHA-256: a7cd2b9d7706766c8378271fe194290c3e3bc14a9a28b900e62418d5a9728416
font_01_sfnt_off00010b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001235a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235A 10684 bytes
SHA-256: 020c1122d44952c85912f209bb8838baad903b120630b43fed979fd6d87a693f

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