Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b8147886a77d96…

MALICIOUS

PDF

70.1 KB Created: 2021-09-05 09:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6af082a78ed366c7035651688dc4fb2c SHA-1: 1b3bf770d5836f66d2b666f8f86f970ff9573eee SHA-256: 21b8147886a77d96eac9b91789852740b0038083be87984e39418c73c08d070d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to compromised websites. These URLs likely serve as landing pages for phishing attempts or to distribute further malware. The PDF structure and embedded links suggest an attempt to lure users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4649

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://garglob.ru/uplcv?utm_term=direct+and+indirect+speech+worksheets+for+grade+7 PDF link annotation
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/fotuvuvedilisaxodigola.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea19a2c444---26542472659.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610455377406f---62025410970.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/11661735940.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/16318482529.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/12fim3l4gc5he629h96uk7ngiq/kifazitibanezesujuge.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/mamaginifi.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947cc6d4f7c---pipitibezixugogotiverodis.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/47063798887.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/fd6e00bc2u8olkmh49gkai9dmp/sipigasajotazaruvapov.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607727266f446---54021788804.pdfIn PDF document text
    • http://siembra.me/uploads/files/vanukigobobetijiralujawi.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/37225019799.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1b80d542---netezadewub.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/309bfc7d753b3ef1d31de8a9165a2b22/motajezodupugoboza.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/97311084710.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac168da5cb8---rubodeduvorodonaxo.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/75805678947.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/tgvchm8tfr6vs4ei0ckc27in53/budavixetegegidata.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/82300526431.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210702/210702062543450899myd0v685u0zl.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/xatubanomelexatanosu.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/bujikafugalazev.pdfIn 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_off0000ba58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26F 11084 bytes
SHA-256: b51a64003737bc1d1025632cb1a5b5998c4b9d2a3c5ff54aca535d18f6cdf2ac
font_02_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 17328 bytes
SHA-256: d9ed5f8063654c71c6832a95a698d605a01155ee300e0bb6e75fe15c7b4203a3

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