Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31b758b367b7e60…

MALICIOUS

PDF

95.9 KB Created: 2021-08-30 18:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 763f078e0371bb40ed25fafb15b372a0 SHA-1: 3e0611503de29b596f858f370e9167319d824a52 SHA-256: c31b758b367b7e60cf6781cb462456cdd797c493d0f39e17adb175f1cf57c80d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://wastran.ru/uplcv?utm_term=pdf+complete+full+screen PDF link annotation
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832b8cdf81---41323827911.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e0e598f5---xapuzavutaruxisugor.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/rajanogazolazipujiraji.pdfIn PDF document text
    • https://polandpools.com/contents/files/fewisiler.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/wogibizesenogoti.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/dudut.pdfIn PDF document text
    • http://tetedebois.it/admin/file/lokodojibonagugazajosi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/rdmfv9iticu8s16b41li5rhclf/falesuberukinebuzu.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/supofuxigogizob.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/hcabbghm09a1frc2qddni3l1mn/4774913656.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/17063015959.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d2b4d6fef---27552708010.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/pikazixewufezafuzazefeluj.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/zavidogolu.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/duwan.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc4257255---loxovuruz.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfab44a1723---nujadinukitizezax.pdfIn PDF document text
    • https://dintek.eu/uploads/file/63172787212.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/57137370658.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/jerogevegilam.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/57063524745.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/5934b93faee67fd835eef0133cd5eaa9/79488556415.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/7658651b73d45d330e6ddfd48d0cfcca/zixabo.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/7beebf16128b81f91e9ac914612cb394/13648346116.pdfIn PDF document text
    • 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_off00011294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAB 10628 bytes
SHA-256: 504b3e07ece9fe8ff2208aece1d9ed5383c4e1fe40708fd325cf6d33a8df6ee3
font_02_sfnt_off000142fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FC 17804 bytes
SHA-256: b5adc5c921c14f7e7e4ce19a1cd5250dbb7c1bfd70083cbb552f7967a39a3ecc

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