Malicious PDF — malware analysis report

Static analysis result for SHA-256 5121f8a88fe5ea08…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 18:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac755c651b17466cd59d05f9fcc69425 SHA-1: 8bf0f1895d9d78e50f716edab7eb98de6308d15a SHA-256: 5121f8a88fe5ea082acc33bf157f08d292a11b13b28e48be75fa3a67a8acf0b4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its true purpose. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://produsedecopii.ro/app/webroot/files/userfiles/files/lilamozofoxepo.pdf In PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ve1cj1c9tr32rt4c69a74e00a4/41400400414.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca652e9b5---26868186554.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/0a11abed2a16952b1655319fd5053734/41465744465.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a7276cb22f523c492cf865e91eac33b5/zafoxovununowumenogakupi.pdfIn PDF document text
    • http://vladekoservis.ru/files/serarinan.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/45087487050.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/44381721676.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/27342061099.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/vesufizeforelopogikak.pdfIn PDF document text
    • https://whitesal.com/data/images/file/8699_20210722225909.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/8446439492.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/49717429354.pdfIn PDF document text
    • http://canoeing.by/pics/files/88612370878.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/7ab900b284bccb7dbdbbe2a8ed56fb06/tufoxufekidat.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/5228685850.pdfIn PDF document text
    • http://becucci.it/userfiles/files/fedaxigaxowakalofun.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfdbd64460---98989701373.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/xakefokosu.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/vaxirerow.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/27243854870.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a29bb74097a---74468988651.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/56924264d8dc51c96593ab7ee563eb72/31734303613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fusionner+2+pdf+en+unPDF 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_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 10384 bytes
SHA-256: 2ca6565df05c5a8056ee4fc588742c7a8cd1283ad6f4a53e8412ac45cd0c116e
font_01_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 20220 bytes
SHA-256: 4a0d28a3db43d325460cf0ad249742434c4aa9594ef8b3ad041255959289a55a

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