Malicious PDF — malware analysis report

Static analysis result for SHA-256 66de6c5dded422ef…

MALICIOUS

PDF

99.0 KB Created: 2021-09-01 03:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c99050685cbfd5a80fea380e3107f334 SHA-1: 0f93be294f0e15d8dcb19682d1bff77e4b5e6aea SHA-256: 66de6c5dded422ef81d148580f26fdc1959ad1217be0b88141b098ec83547781
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=examples+of+fixed+alternative+questions PDF link annotation
    • http://jhroseclassof77.com/clients/45984/File/2548032145.pdfIn PDF document text
    • https://mattress-leader.com/media/12044110626.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/lokabotetove.pdfIn PDF document text
    • http://sql110.com/pic/70811043273.pdfIn PDF document text
    • https://blugarden.eu/file/46731592571.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/32348542908.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c56bec7066b---10962022671.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/95446488296.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/233ef5ce4cf8ed5f7b5e86c1e54347cd/tebugenovibinel.pdfIn PDF document text
    • http://yanartextil.com/firma/files/27052722093.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/39951430684.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf14bd10f8---varuzojorugilinotelif.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/musazigejowabaf.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/300df4c9801c32c0dc214d047b7dde91/98617381670.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6opfg1tvbnq55u1oa8umqfs7n0/basejunulenapituxufum.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210616_4EA06D887FACF97B.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/39515894937.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/70186343639.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///61410963436.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b08a5819466---sememawubigowowoxagidawix.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/doliwopepufepujudogepu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d8053c3af---faxebezoru.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85396eeb29---20540173129.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001331e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331E 18848 bytes
SHA-256: 8b0cc6b5f555ac8573371d8aee86f121cd9a821c20ab395aafcfc5feb68547d9
font_02_sfnt_off000163d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D2 11056 bytes
SHA-256: cd2a2e52f0a4af923c4413efae0822289f8d475470d0c83452e6596953ea2b15

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