Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a07680aca0afdb…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 14:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6973b17c5cb2aba426b8c419a0a469e0 SHA-1: f4fa45f4d8a9016976089a8fe3ac6ba49e50f9c8 SHA-256: e2a07680aca0afdb2804aba175cdab6da76adf70f73a79489050fa0077359607
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic points to the use of compromised WordPress sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://irlanc.ru/uplcv?utm_term=android+on+kindle PDF link annotation
    • http://infoegrafica.com/userfiles/files/83734245094.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/tukulafananiveku.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/27419899752.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/lbnrcnpv9hqng5dpltd625c1f1/53195956245.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/gexujakorerelofogamima.pdfIn PDF document text
    • http://sparkpro.lv/content/file/91529229553.pdfIn PDF document text
    • http://kunbot.com/upload/files/milifefevakebatatawofivuk.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/vufodurekidojokanizipava.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/46144601872.pdfIn PDF document text
    • https://digireg.gr/upload/xegexef.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613283e176810---kekopel.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/setilezapeves.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161480f3f4909e---xetujesetumi.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/nufadurotuvuwomobamaj.pdfIn PDF document text
    • http://slovoveri.org/userfiles/novegojeniwerexox.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/48380806916.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/josaririxi.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/5649478688.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/jonuditosotadisameger.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb9ad63d2e---mujizo.pdfIn PDF document text
    • https://bnovum.hu/downloads/xizigalagojudununufuzobar.pdfIn PDF document text
    • http://crediramasrl.it/public/file/refib.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/12441637865.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/xajepamamorelufuxerosum.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_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 9884 bytes
SHA-256: 882cfe440d27fd59154a6bae4de0edcd8b85b61ed1b0b9bc4473f29ce47d743d
font_02_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 17496 bytes
SHA-256: dee6a70c29d9a25c2f685ace67c15a7f51def80e0cdd02587f216eae7160e404

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