Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9275e17b662fae…

MALICIOUS

PDF

81.2 KB Created: 2021-06-17 11:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 849dc073e380b910f9239cf12d8f31b8 SHA-1: 16435f194c067599d02f1b04b6f5422f0cb3181c SHA-256: 3c9275e17b662faeb9ae364c7e94b20857daca3b38c69e7bdaec5aa6d789ffc4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the links point towards an attempt to trick users into downloading further malicious content, possibly related to game cheats or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=marvel+future+fight+unlimited+gold+and+crystal+apk
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4efb8d0c3f---48795563082.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e537408412---58443350925.pdf
    • http://mashtalkandil.com/userfiles/file/famufuwavomi.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ca2b0d20f5253d1af9c0f2c61e1086e5/wiruwabedajigud.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9e54e41e0---31843343706.pdf
    • https://foundryindia.org/userfiles/file/rowofamimukerenufezi.pdf
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/busixanoxefuv.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/hsi04ovddcg9n1u5pk10pj6910/linalebavumuwexevinu.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160875b2b449d2---32329360064.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc69c09e84c---foguwotadaxataxiwilomiwu.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/1968ed705bd19ee680d1563ab0c2fa53/8492365867.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7f3d7c0f8f745f1d85ea12f34872617b/83867337613.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a613923b645---66005043256.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863788952c9---41502560209.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/54b82a223aeadcc9833285d7744740b4/91757629040.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe6c.bin
cff166c0fbea280e8b0ecd3d0957d7e746c1d482ed79f52538bcda2a5b3a5055		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 5800 bytes
font_01_sfnt_off00011220.bin
cbedc8f6c99b5de5a854d7b8e93611ae53d16f471a13e36d996796bf22b3daca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11220 10952 bytes

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