Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0caf6b1b884bdf…

MALICIOUS

PDF

71.2 KB Created: 2021-08-12 02:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 4ddcd8475a2661da0a4ded54c2127936 SHA-1: 168b1eca6976cba4bd1721ba5990ce83ee83ba08 SHA-256: ab0caf6b1b884bdf66482c7f63ccea232a79d515e9aeb9ef9548545eb3688cc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://phatnang.com/media/ftp/file/86020300574.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a2ab5e60e161c8d26d1e2ade8aa12a95/63340057460.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/reris.pdfIn PDF document text
    • http://espokebar.com/uploads/files/3667012314.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd26cdbe5---nesezujidudipi.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/loziposiwipadabe.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f922eb2cccc86bb4ce390712bf25b36b/mawevugefale.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210621040640.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/80408800318.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/70555019731.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/65581934609.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/73938488003.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/rubomulejapuvalenepifaje.pdfIn PDF document text
    • http://axwelindia.com/uploads/47140058478.pdfIn PDF document text
    • http://lnyy.cc/uploads/file/1628625429.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/81576325233.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d28554914bbd006588bf563500c99ab9/gevogura.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/88791076859.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac12c69a043---83684677785.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33c9a09ceb---29107258707.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/komuwetolufufidiliku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=exercice+chaine+de+cotePDF link annotation
    • http://medlab.webd.pl/upload/file/gexaveja.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_off0000b68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68B 16572 bytes
SHA-256: d84adb0de644694137b0472520a5c836d58af117da5d43a19718c8a8141d5ace
font_01_sfnt_off0000e05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 10340 bytes
SHA-256: 91552cb9b0323a2fe8b6d00c1215120247d65e58b5f752b20632b86260a6743c
font_02_sfnt_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1