Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26f23e869c836b3…

MALICIOUS

PDF

83.8 KB Created: 2021-08-18 06:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb0d54b1a01ebf3c666d5f8252ccac7a SHA-1: 8e5325ceff989b7990b9f1ed26f7b9a20f2e88e7 SHA-256: a26f23e869c836b32e6a64dfb5d21ce62c46cacf6124f893a761038f8d845863
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress installations and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/987d753a2635f3b7c08949b56f0961cb/74522030173.pdf In PDF document text
    • http://ehoron21.mn/uploads/files/53680632298.pdfIn PDF document text
    • http://carszana.com/image/upload/File/74879614859.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles//file/tarixoketijipu.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/5ab1070867a1433ef1b6adccdae168ad/jejofadowufogakelovizol.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da59d3bf97---webanajemudopexi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bea48733ab1---2897977975.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/51cd496da22105e6521665771d6394d7/bolipagazugigovevik.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f9a45e88a---76202432071.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ab511a530---74829533272.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d64301718---92249222624.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/kovozobizifitote.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8362b18ccc---88940237220.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b989ad997c3---wepofetutaxovasos.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c3008cca26450a9691ddf1caf83bc251/gobopoda.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e748092e9d---kodogixadogikepumik.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092b8ff34e24---78848899385.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc31a5e59a---jadelabuko.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/42699652136.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/pmgj82snaa6tacnpnhl4erd374/dopowasakibejugi.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/19987935768.pdfIn PDF document text
    • http://russia-ex.com/67116753744.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/ratuji.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/3a07fe4e2be4d0057fb0c9aed8cd0554/taramevelusesu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a54a82650---48791795527.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/18186498819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=wh+questions+exercises+advanced+pdfPDF link annotation
    • 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_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 11080 bytes
SHA-256: ab0a73d68ac93d7ea1d450190637a66cfc350f4eaee4efc938677ddda5b96b12
font_01_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 17356 bytes
SHA-256: 964f1251f853a1809f3ffd10d28f7467a8572d04e27776f08e9217cef1d2c927
font_02_sfnt_off00012807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1