Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8531c618e45088…

MALICIOUS

PDF

71.2 KB Created: 2021-09-02 09:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa0b9ed800b28321eeb8f769402c38e8 SHA-1: 73baf87baad569486ba8a0c3b0022d86e7d18301 SHA-256: 4e8531c618e45088b1768b7dd5ff888e67f4d6cb41486189a6923e5ab35552b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links indicate it's likely used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://psychologadamczak.pl/userfiles/file/lavaxoxavetipenimiko.pdf In PDF document text
    • http://alumcity.ru/userfiles/file/zekigegikil.pdfIn PDF document text
    • http://imaginove.eu/data/Files/44285238418.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf81f88fcfb---wawesudujasisujabubesu.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/jemomatakemipubegaluk.pdfIn PDF document text
    • http://kyea.org/imageuploads/68163601476.pdfIn PDF document text
    • https://promise-land.com/upload/file/4973644173.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef810d5125---pogopejejovuwigiditil.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/gosurolozum.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/tunik.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/bilawazanokogupuv.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/84ftq40823cscbmio0uutpepkg/26065594774.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uo9jlcui2doome35u9undps610/tijumo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe4335a2dd---koriwevuku.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/9fa73a884a7c59f991c5945250d8dd76/vosupupidibexetus.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607835a9a6c6b---duwefu.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/kolulen.pdfIn PDF document text
    • http://asfalon.com/__files/file/tewit.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/gubowa.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b0df052d7af6f02acc28328cda6af7a9/wutoxafegilidun.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/gbevjdhfjkrnbjt8i1e1sd99h4/zitexivofaxenewekowezu.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/0ebf5d7802c0055f9e21bd2946fbda59/37446669659.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/pozeviga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=indian+river+sheriffPDF link annotation
    • 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_off0000b7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F7 10204 bytes
SHA-256: b8c5c9db4e7e333c229e01042a60f9e0c4c99ab9d9b2b7f6877c2bf39bb5a62b
font_01_sfnt_off0000cebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 15868 bytes
SHA-256: a035a0942a2a2b45e8cd6e999d26dfcc13b0611913857f31b6c8a43cf5721aca

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