Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e777a747c5c8ab…

MALICIOUS

PDF

80.4 KB Created: 2021-06-10 23:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7bf5333fd42def0f06e69f4f252aa95f SHA-1: 15479695831e211651929758f643ba72e17de2bf SHA-256: 22e777a747c5c8abf7ca3d076318e331156fd6011f084607331acf7d4491601d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports a malicious intent. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a search term for a movie, indicating a potential lure for content piracy or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=my+hero+academia+movie+free+watch PDF link annotation
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3ffd78a70af333b27bd8b848b5ee57db/62271274877.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/98036699688.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/sepimadubiwufesogaludet.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/24846381460.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/kodavegexumejokupuw.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/n2ae4s2d1icfd1i1ukica9ecs3/54528474567.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4972d5c2a2289ebeeabf3fc163f450d4/janubifokulevodagade.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/0hdbdafm8o77r3fspbh3ehgi5a/43281771737.pdfIn PDF document text
    • https://bem-sa.com/img/file/fadav.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089329a411c0---90745816999.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/17537652219.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8b01aafd9c79e657c4fc01a976ea5518/dosovetojopexafejexe.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pebodiwejojukegoforilu.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ac6a768a38dc73b48971683a0ac969da/43898535537.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/dgdjrrhmuftlsg993dfqvp9bv8/tomakubigazulaxejalabiwom.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/wokeveguki.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/2ea7f28d05f1055c897773446ef81e61/88543512802.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/musipuzajaduzor.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_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 4992 bytes
SHA-256: 7a25bd6d136428128caeea8821eb2dda875bab35907a186506da658767cba58b
font_01_sfnt_off000100ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AD 10912 bytes
SHA-256: d715e59ea0f0bc3aa07955cc4c9a68b986e20ac47f753cd1d7bc5140127886c5
font_02_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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