Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a7d44329aeb1da…

MALICIOUS

PDF

91.1 KB Created: 2021-07-19 21:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffff351cd42fc486375857536fe000d9 SHA-1: 7702e577b6f63c55c17f780b102e4813cc6cbdc6 SHA-256: 28a7d44329aeb1da656f64e5bbc40e73616a2b07aac57830be01e0f3b9613225
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites hosted on compromised WordPress installations and disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://barrybusiness-crm.com/ressource/devis-photo/files/porogolovupagigipaj.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083abf94823c---xetawuzibitesom.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/74b48d3f699b2a40ebb43ff0340deb45/10768595812.pdf
    • http://bulgankhangai.mn/userfiles/files/45871524750.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1ff77a061---1498363949.pdf
    • http://djapm.com/userfiles/file/59398200357.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af72d1550f3---63917408165.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/u2b7bef3lv3eq99fp22afn5hd6/84651743353.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4b2119327406897e445427ad124ae250/gewadorukobew.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/k0thd1m67u19rvr18s4790aup6/joxedasoxuriramabakilafo.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/rezovejulefabibusanez.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/81ddb3be8e729aa096d9c0552420a2bc/98402866823.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a785351d---satexujisujuge.pdf
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/90142649009.pdf
    • http://abwcockeysville.com/uploads/files/62342284560.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c2ace88cef33f1e8a94ddebb446315fb/75584659024.pdf
    • http://ogledalata.bg/uploads/pages/files/nemegovapokukopu.pdf
    • http://atut-biuro.com/uploaded/file/tevevagekazub.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/61471545388.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e335cca7c---gisifisixojis.pdf
    • http://synerfreight.com/syner_upload/images/files/metixalevedawobufarigaw.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f5a3d358104ef12e51a077787fbbda63/17903741213.pdf
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/83913975122.pdf
    • http://cpils.com/userfiles/file/3463819347.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/1590pd9buipnp0kbtosa8i8uk4/30647743425.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=air+force+abbreviation+for+captain
    • 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_off00010115.bin
24116f819838933feea077dbcb26b1a6a4e21db74ef04751f1f3828a7c1d0b51
pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 10444 bytes
font_01_sfnt_off000118b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118B7 16792 bytes
font_02_sfnt_off000130c9.bin
2e98766f9ce2c0f9b3a8152823c3b1b10f7418c44a810debf9715a205ef747f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x130C9 17656 bytes