Malicious PDF — malware analysis report

Static analysis result for SHA-256 e534526c92db7bd4…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 22:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0fd3db34c0ea8227d9ccef7f43054e1 SHA-1: 800ba7219f1e106ea85afbed683cbaa2c7b9fb8a SHA-256: e534526c92db7bd46d99e7f57bb149c25e49d5180e446c0f5bfb092bf7a833ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF's primary function is to host and distribute links to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=standard+operating+procedure+for+pharmacy+pdf PDF link annotation
    • https://www.ewdel.cz/ckfinder/userfiles/files/68823786382.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/77191722572.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/bobigofejezawin.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/litaxova.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/61896359174.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/xofufatonetiwatizizelo.pdfIn PDF document text
    • http://clingac.es/d/files/63108517337.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/42294873357.pdfIn PDF document text
    • http://proxima-design.cz/files/file/64075602642.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/mibevemanegagotojokanozi.pdfIn PDF document text
    • https://33mobility.net/uploads/files/loposalulurifuponujoja.pdfIn PDF document text
    • https://ghnservizi.com/file/jukidekubexuderuna.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/golukarupirovelejadojala.pdfIn PDF document text
    • http://giga.sk/storage/file/77424907798.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f7421aa71---zavoturaza.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/76b49bb38563351d0ec851379c71f349/kowolapegi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/40np2trvgflieg855ebf33tge7/77459309997.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160afc98958dad---wedifudut.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/merexilezibolomizud.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/baf08us06avbfmhgp2va1ipemd/2984718427.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/39501199747.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162256826883470123844.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966ffec4191---pikubofavosodux.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/27290329744.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_off0000db27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 11140 bytes
SHA-256: 1f9f492033f5a52157a432cba67bc1e01b6edd92ff110e704b037b9f72758e46
font_02_sfnt_off00010ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 17256 bytes
SHA-256: 8a5569ee24fd20b20e0515f12e0cfaa715c0773b6a6fe2e19159f11713bbfb26

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