Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea4fdde120c7ca9…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 14:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 220b72b6934ebbea7b77c08553841093 SHA-1: d6a9bdfe30ebfe7a80518aee27ddf1073ed7c05b SHA-256: 3ea4fdde120c7ca93c64daa5ac64fe3cf012116f53c7a9dd5a6cdccb81b3f905
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external sites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to distribute further malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://krisoc.ru/uplcv?utm_term=gargantua+y+pantagruel+libro+completo+pdf+en+espa%C3%B1ol PDF link annotation
    • http://hanilkwanla.com/uploads/files/26256672251.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1efe0f3a7---pagetidi.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/wiwam.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0050debb7---94603334717.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/86887826879.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d5d2508f9---witunozagorekibaxoris.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a95d9bbdb---lawaxokena.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5912f0da55---75785052314.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6909bdd359---70638351188.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c1f99d326be5e00c93abe382069f984f/nulewozivunisaxukixigevuz.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/37692354333.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/de4de890e1cb52242a9f4b29f907a758/47520058482.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/91289925bdc457a2f831633bd342e6c5/97996488548.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/98931815045.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160891722a37f0---sijexevutopedisasobedipu.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/pumafigeloxu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0e7c8dc1b01281ebf5e12679e74c8f05/fivamixofekevivadekobonef.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/5vojhl4ctbcgu9b823o9dt3r5t/54858182928.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/xixab.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/0f19e82502b1e3483e4e6143940a9818/zijowuzikesivenejawufa.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/78819486932.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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 20632 bytes
SHA-256: bf5f25f697a82ae8ff79ab09e78b31163708560b1f2e63a6a348ec44589b4c30
font_01_sfnt_off00011853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001306a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306A 11564 bytes
SHA-256: c37c8917600dce61c8cb6510c25de72474a633c6e84d43f8261fc5eb91a195b8

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