Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2c12942d0f5319…

MALICIOUS

PDF

78.7 KB Created: 2021-08-27 22:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1b6b0153a29f53aced9d7f5d6347e5eb SHA-1: db168c7e60b61c21964b8abbc7d4f6701e0c9972 SHA-256: 7f2c12942d0f5319b89aec33692fc9021e298fb12ec8789791006d33f6e438d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cgl.lu/userfiles/files/xuramajivaju.pdf In PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/59488439610.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/1204116928.pdfIn PDF document text
    • http://airsoft1.ro/files/file/41204438927.pdfIn PDF document text
    • http://rs-entp.com/upload/file/53673226122.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094a78e32fd1---60480989073.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/54192979160.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/71080615454.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9roidc5iff5mc65g27qrn37sqs/dazep.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/40152069567.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7271c553c9---74272272998.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d9f3d0e74b16fec56b3a9479f2097fd/45822563701.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/weluxiku.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee71172d23---79478240837.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8b3fb2f20---47949219958.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/091615227745.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/lixiken.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704e13342fb---88562563829.pdfIn PDF document text
    • http://hill-macktribe.com/clients/7/78/785e88641dcef8d5cadf71fa969cae92/File/xusadinu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac646acc963---ponitanuv.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/mefinilasidulumuxabe.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/pilipixabawejanujaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=five+sided+polyhedronPDF 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_off0000cf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF02 10384 bytes
SHA-256: 2f1b2cc18078aa2f31e32f9ac0893a3a6f026bcbcfae8abba937fd5e7b36be7c
font_01_sfnt_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 18136 bytes
SHA-256: 7169e83e80a6b62c228526319a0650b43f147b67b10a4a7f4ac026d58b582200
font_02_sfnt_off0001157f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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