Malicious PDF — malware analysis report

Static analysis result for SHA-256 d838e4f5dd2120c8…

MALICIOUS

PDF

70.5 KB Created: 2021-09-08 03:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f6ba386006159cc860a6044d5a33cfcb SHA-1: d34c6e938a29bde684922aed656ed457823c53a7 SHA-256: d838e4f5dd2120c87386dd747dcb063d43d57393b6c9e51a3afac7555c7a4a64
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bnbcostaverde.it/userfiles/file/99146314582.pdf In PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf1d2a299---rogamejamasanikoduni.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/posewimigago.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a2de02e8d906af2309ef7d897ea4da1a/27142790381.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/lavisetonagedesaxo.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/33632829031.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/91825432110.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/28354823843.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160986ad9280ec---76914065706.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/rolesuputidatadivewoduni.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612024fe9e69c---limubejoguzasupisezovo.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d80e4aeed9a5f5299a14b7c8c43a556b/47972036382.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/nesaborolanuwodamufisafi.pdfIn PDF document text
    • http://dejede.com/userfiles/file/36494013729.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/8057ro4gbedoffdqinf0f1oige/11304738461.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/9c5534c4e479e7b48842b23d409a4dc1/tomakutesonojebip.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210601_24664E6FB79B9B43.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/995m6c9aghl1g14uf91b0t253g/jaxenananuganuz.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/20100799854.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/bubuvaladisobel.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51601894937.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/64849052397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ncert+biology+supplementary+material+pdfPDF 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_off0000b534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB534 14800 bytes
SHA-256: 86bb7638175d23fb506dc0739df10126bd7ca259dca6a079beaa07dd204bf6f8
font_01_sfnt_off0000da0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0B 11292 bytes
SHA-256: 0607545c9bea627ddc524421c2f2357f148a26cc3ea0d8202950101c3feb8ec8
font_02_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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