Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b87d3564a739ae4…

MALICIOUS

PDF

74.3 KB Created: 2021-07-16 19:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 32a4033a53c53d223f050c472bf47269 SHA-1: 54fc22ca25c4e792093fc021ebbf8098d1507616 SHA-256: 2b87d3564a739ae45cdd4ca7ed9df967eb9f12ddaa0f7ae4b43c3ced93c773bb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm pointing to multiple compromised websites and disposable hosting, designed to redirect users to potentially harmful content. The document body was unreadable, but the heuristic findings strongly suggest a malicious intent to redirect users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/kilofo.pdf In PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/c218c1a86c7ef0f00723c66618426ef0/60247733716.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/83403655167.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/83058820817.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608710ff47ed7---luruvimopewuzemu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d17a25cd0a287521c505cc338a229bbc/67248103247.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/10601480738.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/bba851a353665494359534321ae2658a/75281360741.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160982213c5de8---91359342253.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/1de96213c491f7f09786b3df08095574/sovil.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/10766178271.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/soraz.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/mipajokegakenok.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/aqbk5tk4fqtu7njsckv7r1hgo8/31907231392.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/gumukavosumofum.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/xukakefo.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/sizawujutimobivusubuzariv.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/epq02tqf2imhg463a3kvhqlnb3/vagosurupasa.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/52839897311.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e154c17af4191aaefdb740aa431f144b/41947805104.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/642187ab9da17b3a0bd989dddad811f6/1516962580.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7b1bd8f3146eba792d6a2fdaa277416c/fipov.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a352f5379c9aa84a92ae5488714fc5b4/givomajowalofitolus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+education+edition+skywars+map+downloadPDF 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_off0000c016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 11164 bytes
SHA-256: 69652db1bf8c7d8a4c69f1371a1f715b7ad462630ca45ad6ef38916a95937488
font_02_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 16044 bytes
SHA-256: d253602314936906427c2671204dd159fc954d6fc941751fe873662000527db1