Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a455f17a220231…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 17:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf4c8cbcd6507f28bab66149cb12bb3c SHA-1: 1f1e16e56305bea1f29116e13efec5786147d1e6 SHA-256: a2a455f17a220231cff915f6cc56319841487859c25007e90d0fec0bec166505
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the presence of many external URIs strongly indicates an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/hnjckm0j4gtaasv99eu7pvo16k/2935728439.pdf
    • http://bndweb.nl/upload/files/zomevefinir.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/so3f0s1d3mnathbcpeqnt7h1dv/vugerag.pdf
    • http://foto-preiss.at/upload_files/files/34721005949.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968e7fa9d32---10213824031.pdf
    • http://macabrey-luthier.fr/data/Files/57896836419.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807b35289e3---bobusejutuxelap.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e8c9b20816db58d0d4898817c33a1de7/zaguzojewusebozakurerugu.pdf
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/rubatonibu.pdf
    • http://gsxr.hu/userfiles/file/21967704941.pdf
    • https://mahae.hu/files/files/wusimapozivikobunufap.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd05dc92c97---pagusevo.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1cf2ae6ae---xavudewanekusogo.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/73b8a1e451754ec78787508b84611673/kejopimenomujidekid.pdf
    • http://wowbond.com/upload/Fckeditor/file/46615240110.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ceeceaf8c8---pevonabasu.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666245b826---vagawakoma.pdf
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/23409184796.pdf
    • http://idealhca.com/admin/images/file/wufowupi.pdf
    • http://ocvitlucky.com/vietkiendo/upload/file/wevugopijenilesumowanu.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a897e7bc2---vufifukosigirotivim.pdf
    • https://shellserva.nl/docs/Image/file/27425268223.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=long+vowel+worksheets+first+grade
    • 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_off0000d6ee.bin
243aac32c90a8cbd1fa6fa89377bd225a229640e72abde0aba075b36fe81fb65
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 10832 bytes
font_01_sfnt_off0000efbb.bin
af3808b83b1ad771d830a5e15046540b8dc5e578c9ceb27761ec837313f825d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 18204 bytes
font_02_sfnt_off00011ec1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 16792 bytes