Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f21a39c107e156…

MALICIOUS

PDF

74.3 KB Created: 2021-06-13 23:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c0adee782b960e1452cc340ff1aa1b9 SHA-1: b5b4bc366ee989a91f22900819556dbd510957d0 SHA-256: c0f21a39c107e156a948fbff1c0f83ae81f6dae00299c15aefb9887f6631e92b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

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://irlanc.ru/uplcv?utm_term=lil+boosie+incarcerated+zip
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094674fa81b1---39517221065.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/59797060975b06ef78cb8d3a9a676654/vetanakux.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c60db093e---68120906905.pdf
    • http://phantasos.org/userfiles/file/57875061993.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/09b17a5f8bf05d8f2c77aaf13c7ad6ae/pajolagedev.pdf
    • http://romanakladatelstvi.cz/userfiles/file/fapezazudowodu.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780104f282b---ximuvimogunejiwasuvosa.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160951defe03e6---16890136219.pdf
    • https://liniagdanskzydowo.pl/files/bigupapo.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14f7ef185---44001740388.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5952a79adc---tefexitefepavapede.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d5fc57323e68fbae8eaf8fc6a5eb0610/23333695368.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e76261c0bea0def1cbeef29fd39fe662/23203968184.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6017b0046---gimosemikulimefavuzisup.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ed74d83e809030fdae07c92ba2b75644/7976468465.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/131aeddbc41062084812e9f7f4c322fe/16667334342.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d719.bin
dedd1c1450a8faf2b11227e5b5b15bd92079208d51792ebe7a33e6d207c579e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 4984 bytes
font_01_sfnt_off0000e804.bin
d6ba0473c15b8725fab9eaa6d30605682b9a9838c90dfaf178eb99465852d1c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 10840 bytes
font_02_sfnt_off00010d04.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D04 4324 bytes