Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6595b301eaaaf93…

MALICIOUS

PDF

74.2 KB Created: 2021-06-13 10:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 87b303eb5e21bd3a70edd18f7b92a17e SHA-1: 505631a300ce65a04bb9e57af791261ea45507b0 SHA-256: d6595b301eaaaf9396d91634cee987e2b46e9d47c68d7c11ec8b995044614023
164 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 contains a link farm pointing to numerous compromised WordPress sites, likely intended to trick users into downloading a secondary payload. The document body text, though heavily obfuscated, appears to be related to software downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=pes+20+ppsspp+english+version PDF link annotation
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/jvi1nq4oe6se701t3usk3elspi/dewuja.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/vuwogebaz.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5e1f1ff31---50053952782.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48f2bb5e7d---fulekaj.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/20662318782.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/700203b3344e23d3357bc5d49d2b0f55/86437655816.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/72028613685.pdfIn PDF document text
    • https://tl-systems.hu/files/files/zoxotevivuvatusisalazo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gigewumesuxukowarafafid.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/jawuzigogirewuzok.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3859b8b36---18816262705.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4db315a800---76697753801.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce6f775bf---jogekudojozilefi.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2b01916419a44408348df8df642d2a73/boramevemuxidelewowigago.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/o5j1goidshk4ov5q026gsk00o0/40401763720.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b27138e292852b59b86f2cf17303932d/jovipunuwepijubexezex.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/kujitaz.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 5204 bytes
SHA-256: 2c2663abe7bb87ec41fb3e6689ecdd803ac0ff52d8441f15bd75a1b222165c4e
font_01_sfnt_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 10996 bytes
SHA-256: 339da454c2d67f7b4bf106ec27794b495a78a1e7f035f76e534b21bd70db6bf6