Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4049da5834504e…

MALICIOUS

PDF

92.7 KB Created: 2021-05-19 23:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74ae30ff69869c170f124e7881e09c0b SHA-1: daec0809f8524cdfa4f6b415b90e5e7f241fcf55 SHA-256: 1c4049da5834504ee406267962082d2b52441ed9038c838691a8b29d8fb121b2
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, presenting a lure of "Russian grammar book pdf download" to trick users into clicking on numerous URLs hosted on compromised WordPress sites, which likely serve as download locations for further malicious payloads. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8245

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=russian+grammar+book+pdf+download
    • http://vietthanhstone.com/images/news/file/mofalimosejimuxumijefonud.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/49detqutpo4qj2tb6bj5vnaqev/guvidijetuw.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/be69bf9133c123513c6ba27527fb4759/8049652308.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/63952a8f7f5c5b94887d3c049c20a60a/43745792038.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086ac27d5561---vemolijibavov.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c31aec32f5---zosoxunapiguvelux.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fc4133734---lewimirageraris.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/tqrf80fjlj36nu812bkbrid2j4/58866469760.pdf
    • http://angarakshaksecurity.com/userfiles/file/18584948994.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609e00b30ec8f---20252926302.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3f76c4dbab9a760ae07cb0b066da79f8/sofewoxexu.pdf
    • http://prosquash.by/data/48750338964.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/2s6jtfucvrf52620rtuo0hffe1/6935327180.pdf
    • http://matstravel.ru/userfiles/file/19403403809.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/r6t89mhh4j41b398o3tuacht31/96286126367.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7a3200ba8---pevokab.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/7adhfo1o0uqaljaee7tiro1fe1/65781825816.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014f49.bin
4a8a5606c4bff15981e3e20d7705d44c8650e0a17dadacac3989d22df167b686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F49 5664 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.