Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f26e739c1d0e9bf…

MALICIOUS

PDF

87.9 KB Created: 2021-09-02 08:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ffc2cf0b592fe590c8c5d8b7855fc07 SHA-1: 9d059fcc08ad6438e8754246c6066451e79947f2 SHA-256: 1f26e739c1d0e9bfafe53fe28c79a47bb7844eecec558bbb8759b292be1dbf9e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.anieliasfx.com/uploads/textareas/file/46792266889.pdf In PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/nosemijotabejiz.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c6b413e66---rekagewod.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/r14maf19977ogr8gm0b3lootl5/15659727779.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f9d01e508---10519686610.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/80566854522.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f75bcc74659f346e56b3d1a5894c0922/51819225738.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3bd6da9bc---2214428690.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/38443958422.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210716173017_ci4m4g.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19dfb0681---73156434151.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/97480941791.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/f16ad8465bdb237675ba430477dc077d/pemeperukudamivuvube.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/14194999041.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/24746617426.pdfIn PDF document text
    • https://bauarch.bg/files/pebenupawidofusoseloma.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/88921923097.pdfIn PDF document text
    • http://christopherdallo.com/file/62014469864.pdfIn PDF document text
    • https://ambalatender.com/upload/files/jipenofasirekikefi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3v95ik41tog4flp29tmbb6ui20/lamajajoximub.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/6055845234.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d9aec35b3f5af96d72310fef232afadf/biditidigepizugovub.pdfIn PDF document text
    • http://dsagco.com/Upload/file/90825740648.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/33510846956.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b2cac3268eee3d794014c7a57dd41f83/26675370843.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0254305f0---botoxigotizuviram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=things+to+do+in+nipomo+caPDF 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_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 17976 bytes
SHA-256: 63b4ab49a0374eaf84aecac786b99fcb3b34d3bc9432c8f8b41b0385b57e695c
font_01_sfnt_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 10644 bytes
SHA-256: 157310ebbd3774a5444c7583be1ac3e28cc14d629d018fa05d7c9e886a4bc5f4
font_02_sfnt_off0001376b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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