Malicious PDF — malware analysis report

Static analysis result for SHA-256 640db67f74c402d4…

MALICIOUS

PDF

814.3 KB Created: 2021-06-29 10:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 92985986310be40ec206c46630fe173c SHA-1: 0e03e07aa51a0f7bcb2af47c7b36dfca56633d2c SHA-256: 640db67f74c402d4a87b229cf46207d35df1986dddf8522ffec3636876bc46a9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or suspicious domains, indicating a phishing or malware distribution attempt. The ClamAV heuristic specifically flags this as a 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the presence of multiple external links suggests the document's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4567

Heuristics 5

  • 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.
  • 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=sticky+fingers+love+letter+from+me+to+you PDF link annotation
    • http://bularz-auto.pl/images/userfiles/file/31839948230.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d2513ac3dd4---guxozutez.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160799b9dd0ab3---99040636345.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ktdgk8291kgp8crj4pu5oo8mfa/16133481679.pdfIn PDF document text
    • http://nakatka.com/files/file/54767170285.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/65656514131.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/978kued4p5bn25b1n45uh8rlv1/27744279894.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xogokajedasixureda.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/ruzadaga.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ece90bb1cc187f61fb5636b4d5d47e7a/roxetizusitorubezufajoro.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/rorexejokorelasom.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/92833021172.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/34c43fccf0083033c69c0e654b1898d9/felugumedisiwok.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/9936000362.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/munenelafunub.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e955541f4f---dojab.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b00613e716b---47985701597.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/tofobolumavofa.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073140ace164---56509938295.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e946386867---sesowiboje.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/legajisawujigovijodu.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/cebe53cbed82b39f6ac3d9ccd99803cc/45559631279.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6efd7440f---82043052248.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_off000c4327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4327 18476 bytes
SHA-256: 2de704e2a25681ba62e6113c667e381216325038f5ff1bc2b91fdfc2a296a518
font_01_sfnt_off000c7476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000c8c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C99 10964 bytes
SHA-256: c748afae65c3cec6b7cf0bdabd19e8cfd29a91f649ef844f5b756dd7209e5af8