Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdac7cc533564b4…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 13:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5850bfce4e1807dfe07a093b24adaf65 SHA-1: f2d334414513ef7cd51bdb160cc859956f64b250 SHA-256: 6fdac7cc533564b49cd408497c4d446171a44b8c3c002fd0295764ce5f73daaa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160843361befb1---mebamunukizigigeritef.pdf In PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794c768d4fe---loxesimadanegovetol.pdfPDF link annotation
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/63558120035.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160816afdb095c---kaxubovidikokeko.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/zojagul.pdfIn PDF document text
    • http://dallaslandscapedesign.com/media/files/jamalizuva.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/03qkbs91umid7mfv1vd2isir97/74204149665.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/90601605506.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/dsd51fkcpoq2qaee3ekma12aj5/lusowadusuluzofakurof.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5da701b14---96051246532.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/wiwavavapupanakututi.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/46014571356.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/repamutowopixitaxatav.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/76878258258.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/labgqiibghs5jphancd5sq3ml5/53520836730.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/7d30a91a592d9c7c3e2e3c99f56a5bd9/56123065062.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/nupadexi.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/7351703379.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/53433451870.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/vimisivu.pdfIn PDF document text
    • http://centronegozi.com/public/jafezom.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4e01c61fb---33807968488.pdfIn PDF document text
    • http://cristalensi.com/public/File/56555331882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=chemical+thermodynamics+for+process+simulation+pdf+downloadPDF 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_off0000e36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 11216 bytes
SHA-256: 5661633acb54319b0d88417c9aec33896a04466654ce8ddf618ccb7a613a31d7
font_01_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 18476 bytes
SHA-256: 6fb3d69e0e9102f9ec0e472bb36ddb8004222e8eb289c19c98ac7077ca16634d

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