Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d38501a9c254c0…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 15:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c900e479e734758658d8fbd1c14ca23 SHA-1: 553e24f7dc09e3eac59e58ecf8e7abe7d57bad85 SHA-256: 28d38501a9c254c02bdd44b8453c586e2c61fb2fe29b2682e78f20efe6595579
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=cholesterol+eating+plan+pdf PDF link annotation
    • https://jpjplumbingandheating.com/FCKeditor/file/61853926412.pdfIn PDF document text
    • https://tappowine.com/file/46260289552.pdfIn PDF document text
    • http://flirdining.com/uploads/files/desinevageribubobotid.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/begosatovap.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e1ee67af807c8ae0f40629c9febd83a2/pimudirokafeledo.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62914ec989---xodolufojapagevudoki.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf8007c2de---93455160206.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079565d13bd7---94487634228.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792c4f08b48---makow.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/nasevalugawafewanola.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/55142370721.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/c0q0ana9rsg2bu1aqtjh30jg01/rudawomimivilezuluzejila.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b122e647431---tumokatiwalinoku.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/rupugokiwobiw.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b550086c9---tijiturovivupixodixitozo.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/rudiz.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/29670058910.pdfIn PDF document text
    • https://nistd.in/userfiles/file/sezinigiluwijafexeditisez.pdfIn PDF document text
    • http://shosholoza.de/file/92980381342.pdfIn PDF document text
    • http://haki.vn/uploads/files/75820252356.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/c9ieu1l0omn0h12s8u6u3e7fkl/78893807781.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_off0000c3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C5 10808 bytes
SHA-256: 69590498aa8df8c83dd2dcc0253a2b76117894b56306e286270e11df272f6938
font_01_sfnt_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 16952 bytes
SHA-256: bcc5868578cc72c4759bfa2e961853d8f6efaaecd92cff9b251ddad453871c9e
font_02_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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