Malicious PDF — malware analysis report

Static analysis result for SHA-256 a768f36f601a5196…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 06:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae9653fae54d8c1b02a98fdaf687e5a0 SHA-1: 5186b68f0d534bac50a91e55b44809219617ac34 SHA-256: a768f36f601a5196a8ac74e43176f2999427d494b9a3c92875a7492695e18471
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://zaun-produzent.de/userfiles/file/guwotogoweroruxixije.pdf
    • https://stijsr.com/userfiles/file/21835438013.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41712cd6bc---kanovamifa.pdf
    • http://mediacast.vn/ckeditor/upload/files/komilumexa.pdf
    • http://portableandcool.com/files/files/vabudunekunumubipebov.pdf
    • http://seamacros.com/upload/file/20280079675.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/nlqooba0clm3ifc99tg04b5j40/lozagev.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37de6be9d4---vafezizaw.pdf
    • https://discovercefalu.it/_data/images/file/21663435277.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a795b7249e8---mekidobazejewiwugoxefofow.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098460e5be98---52626107842.pdf
    • http://amandamaitland.com/images/file/95251652781.pdf
    • https://eagle-aviation.com/userfiles/files/37537957401.pdf
    • http://www.sealjet.mn/pictures/files/jifofinaruwujitazar.pdf
    • http://chromavials.com/d/files/67754390299.pdf
    • https://samoinstitute.mn/uploads/assets/file/lupidoxevomesulilejoto.pdf
    • https://sanaspinler.com/calisma2/files/uploads/dewununox.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/721jgg79sn0jcs9hsn96ejkaa8/vemewizut.pdf
    • http://jarauwerdaenzn.nl/userfiles/file/61488316681.pdf
    • http://brlairport.com/images/file/memiguromaligidufiju.pdf
    • http://vizit-k.net/uploads/editor/files/57789331023.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ceed7ea019d---60323043493.pdf
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/22032108283.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/f4nts2tbipdv6g3do7tu705fo4/93172268503.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=avanza+g+2008+manual+jakarta
    • 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_off0000dd33.bin
ec13ef61a0a471c6efba0cbbab816897645f0fb71db3598a3a99d34509077db4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 18296 bytes
font_01_sfnt_off00010ce3.bin
9ad277f05826c9b2a656916cb3a109c6fbb1938eaa466fae8048468509cb6011
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE3 10820 bytes
font_02_sfnt_off0001260d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1260D 16792 bytes