Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61012026d5c1f40…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 00:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 262cae952605474a8d54741091504829 SHA-1: 96e81308b28f1ef31e70017847844a7740ddab7a SHA-256: f61012026d5c1f40d2d90e54ce4af66d02fdbd48bf4e17ac413a827f031cc952
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=starch+based+bioplastics+pdf
    • https://karpataljaturizmus.hu/upload/26878871680.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b107e022446---wabupenodo.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2b4b484f6---mezetugonixarexapop.pdf
    • https://icbacademy.com/upload/files/86129802915.pdf
    • http://jatyn.cn/upfiles/202107/file/1626501560.pdf
    • http://texmet.pl/userimages/file/xasegamavovafim.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc5694e419---42242306584.pdf
    • https://etadelloro.it/images/file/94812854101.pdf
    • http://korvet-sp.ru/userfiles/file/82101185312.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/16a8734c21bf3c6a4e10474a6da3375a/fuwuregisavepelalunujigod.pdf
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/dujuj.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b32386086---66393421384.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2a1673a361fc7f6ba8a9bf08f91e9c0a/99697758819.pdf
    • http://cancunday.com/travela/img/files/49382526985.pdf
    • https://mb-classic-service.de/userfiles/file/wuvamopavapipajuzoligunur.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135210656929---xidedilefa.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/46607866191.pdf
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/76007720287.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f00ab5d4c23---jewex.pdf
    • http://yesilderecine.com/admin/editor_resim/file/56148798257.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/aehv66b76e6knnjm7lstpetd33/11693355427.pdf
    • http://valeneighbors.com/userimages/zalusetanijowefubamobajex.pdf
    • https://cornerstonelaw.eu/userfiles//file/43466455750.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1610ccbfd1e4d1---wezijenoz.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cc7966badf---kofif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c336.bin
cc49aacd25869609fcab6b5817b10955902b2b0453040c19f2befc175069e687
pdf-font-stream PDF embedded font (sfnt) at offset 0xC336 16076 bytes
font_01_sfnt_off0000ec60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 16792 bytes
font_02_sfnt_off00010477.bin
8aa5a8ddfe06366db5f6a4686bf37161456c895290fb473df93973fe6eee858e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 10828 bytes