Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f591263e903fef…

MALICIOUS

PDF

101.2 KB Created: 2021-06-11 20:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5a54a18add9491989d150fb6ebfd726b SHA-1: 1f1ea0b263d8a5ca20d90bad76199602a2a56186 SHA-256: 86f591263e903fef269c7c50827cb98bf5c509a99da49da85636a0725d2e1a54
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=bijoy+bayanno+bangla+typing PDF link annotation
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160908785885be---84523784949.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/23979982877.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ukrejrfso07805l3d0omkj9v4g/fiwupukiwi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/654d9cb01eabc0a193d277d152860d48/53805984729.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/xowupuxezedinuvan.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744fdd65167---kudatu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac56ec1f1ef---sigizogoxevogi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e52711b50df786ffa7102170495727de/80602556928.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/5759ac506b242b61407de36b9d90caee/gezivesegufojagudopiw.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/dowotanabagevipinuxapu.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/fulekulemobepavutil.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file/%5C/72390272234.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/jodufogo.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e76342e528---tudirapapizugafazopez.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ecb0733aeb877899c34225ef1043b9ef/jajaxagedilujifamoniwe.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF41 1556 bytes
SHA-256: d07f3d49c9cced9ba225b5ec5b70b8c2f0e2ee71e1d5c3cb42553f235036627c
font_01_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 5080 bytes
SHA-256: 1880300444346e963a02fbbb32cef329870196f226f3b5c6dfffbba77735a844
font_02_sfnt_off00011896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 15612 bytes
SHA-256: 17affa5049ec69f1150e1eaa2290698f2d1d30851d668172c3cdbef3d1548696
font_03_sfnt_off0001471f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471F 11908 bytes
SHA-256: a297634755c1a90c549edaf643be0740ef590a1f02f6be4d2a39d470457247cc
font_04_sfnt_off00016f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F01 16116 bytes
SHA-256: 7488b24a4a5bd2e48f2d4888cd15dae324c5369a94ec21a00d8cf27e9056556e

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