Malicious PDF — malware analysis report

Static analysis result for SHA-256 740bcdec758b5b49…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 17:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a93aea3ae56070313d1d5cd0f9c86d57 SHA-1: 5f0941bb405953c68105022d2077d22a34744aa2 SHA-256: 740bcdec758b5b49aea0c6492cfd5efb74767827fda780571e3b641905d4e5b5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely for SEO poisoning or phishing campaigns. The embedded URLs, such as 'https://wastran.ru/uplcv?utm_term=american+yellow+lab+puppies', are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=american+yellow+lab+puppies PDF link annotation
    • http://www.deco-interieure.com/userfiles/file/32943621152.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089147811c06---40806638195.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0feed3f0d3---wuvuxik.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7607bf8f9---wosazixijoxoperuxi.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/gkr892368u55r9eaf2qvsiotlq/13164146014.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/faxapebatuwakiwotuno.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/fudofi.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/50228979918.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e24d86aff---15907390544.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c8d772942ede1979884681daa27f7a98/gukumodiwawewarut.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/26439917876.pdfIn PDF document text
    • http://mcutech.net/upload/2021/07/file/16272511471176391816.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0e2ff3fa527a6deaf17231aa69b09852/tudunexagogap.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/usm6adgvo8hvuccj2nn4g8k0i6/38285678870.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/40409853951.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e9657304124---2232285984.pdfIn PDF document text
    • http://ippon.lv/uploads/File/jakugajatupazofukada.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/69712521240.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/donura.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8u09fcd6rj2t2f8qit33huv9p0/bepafazefowojinuzajife.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/23446500568.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2406605a6c---19667855098.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/17172771928.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a0de129cdb1ef9e839df48d042aa55ea/61196719474.pdfIn PDF document text
    • https://morabia.fi/images/file/gikuwumo.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_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 10860 bytes
SHA-256: 490c1c1d9a16e46fedddd8b0fa5852759907da417e99804f4d2c28325c7aa9a0
font_02_sfnt_off00010eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 17672 bytes
SHA-256: b0f17cfaad6654917020b43f7f00944972d18dcec489427e1857a24def81b48c

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