Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d606babb2f6eef2…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 01:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ec7ef84da17ac341549ec8cbb276d01d SHA-1: b352ab678914f9c0f4b7305a1d4b7e9e1fe3acbf SHA-256: 2d606babb2f6eef25f05c8294a13020c7faab1a572a5d8c8144fa92f6f12c303
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.childofafrica.org/media/userfiles/file/96698775515.pdf In PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/49987424816.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/89568769520.pdfIn PDF document text
    • https://bem-sa.com/img/file/moxeborex.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/5300325145.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/32981948661.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/vudezose.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/68548198337.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/80674831232.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/41493239191.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/qpqua19ku2hn1eltv7vrb2e9i4/69447379387.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/487523289.pdfIn PDF document text
    • http://abpaluso.com/upload/file/fomoxala.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/mesawagigizizabavojumo.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/83415185628.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/88993948124.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/16041191082.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f986ebee412---nasulipav.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/81677baf0262844df5d0e4c6fd73456f/merilepapizuzitebomolegot.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/nujujeruwuzaxopemedom.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/78441050015.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612938f7235cc---mafilirutixumuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hydrometeorological+instruments+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_off0000d151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 16448 bytes
SHA-256: 7ded3eb3f3ed1721b40868cea637f8c93d44d951008de5521b985fdc6af2bb25
font_01_sfnt_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 11168 bytes
SHA-256: 08f5240bd7105d1243a3da3d61f7c4cb696c05a1c73dd37af3a84583008be29e
font_02_sfnt_off0001157c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1