Malicious PDF — malware analysis report

Static analysis result for SHA-256 81264013c1ceb251…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 12:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15daf3275a76120d10c371e2e824f741 SHA-1: c596549731f3670c3d7211c84a41b99376a9ffec SHA-256: 81264013c1ceb25176704416ffa8637c21c4fe14c2b990ede203c084e13c2c10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous embedded URLs, many of which are unknown or point to potentially compromised sites, reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/bofepola.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161341e7b24cf6---87617492117.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/91003935714.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/komokuvado.pdf
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/rifas.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee7aa4f087---jagirimovet.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8571168a6180128c9545f629629772a1/70471923813.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143055d1e66d---regarobofeririwidapon.pdf
    • http://klhl.com/userfiles/file/xopep.pdf
    • http://cachnhietcacham.vn/Images_upload/files/48634182957.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/fowogoluranowuxanu.pdf
    • http://trungtinjsc.vn/upload/FCK/file/99732950933.pdf
    • https://olterus.info/contents/files/zeranonoferik.pdf
    • http://e-sportis.com/images/upload/lowadiroj.pdf
    • http://erbaytag.com/resimler/files/puvov.pdf
    • http://webbuilders.com/files/file/munukinofadokemidad.pdf
    • http://scvumaichiramen.com/uploads/files/firuralidojogoloniteteze.pdf
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/76554569752.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb55a319ba---82531035756.pdf
    • https://dailyhondaotomientay.com/upload/files/bidixofugipuvesomimu.pdf
    • http://vividconcept.in/userfiles/file/40527759881.pdf
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630563310/files/43007230987.pdf
    • http://www.como-grup.ro/fisiere/file/4263494772.pdf
    • http://hotelpenza58.ru/ckfinder/userfiles/files/10472707170.pdf
    • https://bln364.com/how-to-sy-system-76s-pop-os-on-windows-
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dual+boot+pop+os+and+ubuntu
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e173.bin
299a353d2551bd14397392bcc0268e8504cac71647be461b5d48d00c2f9e94e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 10300 bytes
font_01_sfnt_off0000f892.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 16792 bytes
font_02_sfnt_off000110a4.bin
492a7024b51e9319455f20bdc0212ce95ad7a8f6ec7956345ec781873d36ac11
pdf-font-stream PDF embedded font (sfnt) at offset 0x110A4 17672 bytes