Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddea6238d2b20f52…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 21:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3a1084d975c29f6242d9c027e1e788e5 SHA-1: e9be673adec9ccbe7921b2892917126f1dfae221 SHA-256: ddea6238d2b20f52ffdf353a751a006a36ee609421f1a79c22783b27d8a383ba
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://texmet.pl/userimages/file/lesume.pdf In PDF document text
    • https://technoarc.net/userfiles/file/rujunorovukoboz.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/tizebagojasuxad.pdfIn PDF document text
    • http://koala-al.com/d/files/tawomemaletu.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/wibuzo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe282caad---2283331835.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f1c263685452035fba1db7a2f7122d53/18227345735.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/kaforofisagudukumiwomur.pdfIn PDF document text
    • http://bwc.lt/i/zijovemugopexeliw.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/69389777011.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/26291161821.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/sobexawadek.pdfIn PDF document text
    • http://farmina.ru/uploads/files/pegapimivujosere.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/85236813699.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/gugumexiboruduk.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/beliwixutufagotujuzuxuw.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d0848a49---53742543286.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/66711121498.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/jubisewakinixope.pdfIn PDF document text
    • http://gr-chem.com/upload/files/76139491708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=kotlin+url+decodePDF 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_off0000cd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 18608 bytes
SHA-256: 90ecbd03e9ee177bdef9d13a63cbb5ecee72b066c42c61be55dd0fb397f81004
font_02_sfnt_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 10124 bytes
SHA-256: 69e13e53126b57ebe52ef96a67638f1ca571a4d012835c8954e1c8bac39edd01