Malicious PDF — malware analysis report

Static analysis result for SHA-256 f075d3974ac36e54…

MALICIOUS

PDF

85.0 KB Created: 2021-09-08 04:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5b40e5d368b76506bc8b233d4f2bc1cb SHA-1: 01e9093ab5d743def69528e537e36bc27b94ca0d SHA-256: f075d3974ac36e54de60a6f2b6fe7373e0c51d2fc06fe4d52475ba283d5c71b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=henderson+hasselbalch+equation+derivation+pdf PDF link annotation
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d1cc8d303c3bc774f7192856e800ddfa/71982093718.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/vimik.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a163c222e7b---94802245701.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/64557500761.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/37881414617.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/53056910958.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092067698616---luzagevi.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/tfjchc4q1vv16rgn5jisro5moi/farubosixip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed11e27b162---98612891815.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/gukelunawufifejakujulobiz.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/92998584063.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/jovonawafebim.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051419301240.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a7063007c8dd83fff3a282858bedaf17/77442892164.pdfIn PDF document text
    • https://kildevangen.dk/files/27143235736.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782e50dbf26---sorowupibewoguzexatozo.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/545355356.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/31e01422779de0ad224259a685509d28/fewetexugigowe.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/60638203594.pdfIn PDF document text
    • https://premium-house.uz/images/file/60618319234.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb26c693bb---71520334231.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05658c59a8---toparerunimokirurabiboke.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/dv1iafbs2ndmklrkti8ocdo39a/70218116648.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac073644d23---97371841226.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14f0b72bad---30936465813.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/mipanalitibipukutamawabe.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_off0000e49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 11160 bytes
SHA-256: 0a17d42c6c955c0c2b504efd5468ec86b9437964041775d17e79e02b0ba3ac44
font_01_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001163d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 18536 bytes
SHA-256: a90db118e84df0e578be04ce5aa29facda23286f832a90ee20b714239d12cf50

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