Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80db76c7c19a230…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 21:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51f5cc8dd5815f3598b8f7114c6b7a06 SHA-1: 6bf5b41a0f9c6dd4f5e274d893e8fefbf876aac1 SHA-256: f80db76c7c19a230b8a4945cd5bc5f164ad74244804296706ac003b0a65de99b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=pokemon+rom+hacks+gba+emulator PDF link annotation
    • https://kolkataangikar.org/ckfinder/userfiles/files/fevusexegirodufovim.pdfIn PDF document text
    • https://pmms-online.com/assets/file/30858945318.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b62dadb73bfbb114e77e2f96d8e61daf/bufov.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/tidalaninoxobepenanevad.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/93856971370.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/sepabiwugibatikoba.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/lonefepu.pdfIn PDF document text
    • http://ktcz.eu/files/files/25659459848.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/pafezigozabukakusaja.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/fizatojaba.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5fa3196af4e75ea63f7f030d09fc52d1/jemorufilepapozosuka.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/19398920342.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/13988409401.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/towigorekoxizebezosip.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/67221449751.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/makutabijebafurid.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc767e7f83---xujipov.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/68315840138.pdfIn PDF document text
    • https://milkywayads.com/webroot/img/files/9167718523.pdfIn PDF document text
    • http://apsons.eu/files/file/80601690216.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/24055962616.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/jitidenulifarejimedunoru.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/25658295409.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/95548828988.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/72982283435.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/36108808422.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 19320 bytes
SHA-256: 748c246f87189f03c195888cba93c3623cf9b6100fc1663c36395cdff86835c5
font_02_sfnt_off000135b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B2 10920 bytes
SHA-256: f7849c3f31f8840e61cff33701a606aac9b4b4bd3387ff6c12692d1ebf61d693

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