Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0d5db05d28610a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 05:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cb1d764562fc0819e14499efd4799bc SHA-1: 0ab8f1be04204e9abf1f4423eecae0dd845c8409 SHA-256: 8f0d5db05d28610ad56e026bdf743fc1ce5a162d04d107702bfbd368586deb4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic indicating a link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://oniceh.ru/uplcv?utm_term=fast+and+furious+2017+full+movie
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/63cfd04df0dba70e7397541904e119b7/25995249448.pdf
    • http://thietbibepnhahang.net/media/files/70765697833.pdf
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/72934154641.pdf
    • https://am-system.eu/ckfinder/userfiles/files/63988576117.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210910_532D9DEBFDCDD419.pdf
    • http://praxis-greve-polley.de/web/editor/files/56419059945.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43a90de27---gafarizalaxokemozuwurofe.pdf
    • https://turkuazhost.com/calisma2/files/uploads/liviwinim.pdf
    • http://vers-ma.de/userfiles/file/38455377965.pdf
    • http://naturalfurnish.com/userfiles/file/56842671775.pdf
    • http://hanilkwanla.com/uploads/files/lovok.pdf
    • https://arab-hams.com/Ups/files/xoturovix.pdf
    • https://pernambucoimortal.com/imagens/files/47784480604.pdf
    • http://gocoachfox.com/userfiles/file/zusixidozeto.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/14e17101ec91a8e55158103072514330/dunipafagaf.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/3ro1gdtssk5gjpp1vpso289u1g/simevatixisugagojidivog.pdf
    • http://yjccnc.com/upload/files/tokukomamod.pdf
    • https://soccerauquebec.com/userfiles/file/38189777208.pdf
    • http://targhevaticane.it/userfiles/files/mabezit.pdf
    • http://habitat3.eu/userfiles/files/wafizozumedukusirorase.pdf
    • https://www.posluh.hr/ckfinder/userfiles/files/jubok.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_off0000df4c.bin
091091f16592c1dd23f33ef8ffc9559068f84cb1d9b13e9bf00fe52d7c3ca8dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 18488 bytes
font_01_sfnt_off00010f78.bin
d2d95375574e34572ad6cbcdc6d729bb041e8698b79ee8d722b5b49b2516019d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 11000 bytes
font_02_sfnt_off0001292d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1292D 16792 bytes

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