Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eab20b091f219ac…

MALICIOUS

PDF

85.8 KB Created: 2021-06-24 23:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fc057e92de599c2bc5ca819c15faff22 SHA-1: 0d62f9ce01ad6d3f4a9a2176f6b868eb79c02999 SHA-256: 9eab20b091f219ac70dbbb1d80e5b978370a7268a0e5c30569a047ed33bfa3ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The document body, though heavily obfuscated, contains text related to a 'brain teaser answer' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure. The presence of multiple external URIs and the ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://drafthe.ru/uplcv?utm_term=moonceon+brain+teaser+answer PDF link annotation
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/4b9d2138c4ea408fd4cf03c7df4090cd/84282231992.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/vemoxujijuwobipusodes.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/68003000340.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3bf8a382---39418053601.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/49249395846.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/fitojifopub.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074fb54390c8---voguxokalazutirexow.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6b2b4a7bd---47675964271.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/60263027588.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/lixipujotulesesukazizo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccbbe5208d---21139279934.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/gugogif.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4037aef4b0---nimufezeja.pdfIn PDF document text
    • https://reniuved.it/file/62027719244.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/39762060604.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 4788 bytes
SHA-256: ccee274352653e73d5113e4738ebd75042a1f1a4735587902d4f3b6296396f75
font_01_sfnt_off00011406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11406 12172 bytes
SHA-256: d10c5fa55ccb6378b5b4d8579c3433f2a91b0cfd77e5dbfcf982b2485d820263
font_02_sfnt_off00013c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C65 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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