Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c38901820ad20a1…

MALICIOUS

PDF

89.4 KB Created: 2021-06-29 00:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86ae8c4544b32ee7fb6eeb8ffcb841de SHA-1: e9fd0110478cfc0eb4130a3aef0f472612af14c9 SHA-256: 0c38901820ad20a108e3177b7623659fb02e75a1a3af2433cc196b1a6be72434
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to numerous URLs, many hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/uplcv?utm_term=transmission+meaning+in+english
    • http://metaglas.kr/userData/board/file/xofalupipiro.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d879562cfbef6851fb56d7e180e25f9d/toderadujerewowoxigoli.pdf
    • https://alihuata.com/userfiles/file/81641863773.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/11ded6u5t5vh8k9djvjrr7abj9/34281273816.pdf
    • https://aonetreks.com/uploads/file/7482454023.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e56bad2c6---lubirakidimule.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8a33a55e0---48358006374.pdf
    • http://architettoseneca.com/userfiles/files/11277333999.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608f925682f3c---91366900962.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2ef84be3---genixulibaz.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607a999bedd91---xisemiguvopepidaxarem.pdf
    • http://fsgpj.com/upfolder/e/files/20210627014236.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pou92d285nud5ngqhj201kooo9/51912720434.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8e1qbuadu9098pguga1o801b04/mogevuzaxoginog.pdf
    • http://kasystemofkarate.com/clients/861259/File/91315200704.pdf
    • http://dui-antidote.com/images/userfiles/file/82086620964.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8093512e2---33061658956.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc04dd7c2---wavewit.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b2c16bd7d---wikuxubamorizaxebawegi.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763e93083f0---kijotoralepiguzuwig.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d08ed8ce75773e5c7dd05b97b6650802/26803337595.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f22e92104---dadinivurafusuxusewoge.pdf
    • 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_off0000fc56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 16792 bytes
font_01_sfnt_off0001146d.bin
8b856e0b31dbc520355bb4b99b5d7e3aee16e50f97cd007de9f859dba5d160d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 10420 bytes
font_02_sfnt_off00012bc6.bin
36a95e7418c77fe2dd91450844fcbe722e44faf93b30121f5a7bb541af0499d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 17456 bytes