Malicious PDF — malware analysis report

Static analysis result for SHA-256 b795ad947550a8f2…

MALICIOUS

PDF

88.8 KB Created: 2021-09-05 20:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd47c6ac35c4e6a88ca8dca0415dd61e SHA-1: 2f7c582974c372534c170be26e2951e0ca5d3e27 SHA-256: b795ad947550a8f2134d00fbfb94eb1203934032b71d9a94f1b11b12b7d65285
196 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or link farm attack. The 'SE_MFA_LURE' heuristic indicates the document attempts to harvest credentials or session tokens by mimicking MFA prompts. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML classifier and ClamAV detection, strongly indicates a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://smidgel.ru/uplcv?utm_term=attachment+style+quiz+pdf PDF link annotation
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3180f81e7bf1778e03c80e6f35fd1cbf/makunofovi.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9501b6f18b4c48d5e831d07efd31cc30/93678937203.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e04a280a4---11190396109.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/sukuf.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/99016024938.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0036ee6f8aca21ccd723c4064b8bc29b/luwakida.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/93232beacde9aca5ca15a9d7ca8bc3f7/gefavitusumesunikonorogo.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/16339915820.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/1iau0qjl3osdc3to6hbqpddc1c/buwibetonumawe.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/94644637623.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/jawuvoxiz.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/8khcdu5op4shf33g7aoof3am4u/rubuvijixajuzowedajat.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/80994693329.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/31742340466.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/riruledopix.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/90281418281.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/pazemijero.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/28759133121.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611b961d1d3e8---bixofinefuragema.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29b9dfe1b---61151544421.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1540e3dc7d---16572332213.pdfIn PDF document text
    • https://businesslife.com/content/file/68327922883.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_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 11068 bytes
SHA-256: 6234dffd402232497e9a32c317efff78c93b28ee1dea2a6db68a6f0c5329cc59
font_02_sfnt_off00012581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12581 18692 bytes
SHA-256: e583ada86aecfb324057226d84a81001dbcfc9ecc4ff2ad85a6204ba9d614bf6

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