Malicious PDF — malware analysis report

Static analysis result for SHA-256 396b42097701f46a…

MALICIOUS

PDF

86.7 KB Created: 2021-09-17 04:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93ddae23d28d89907672f78adb9be6c4 SHA-1: 06d85e7ef61cdded28c42baf1eea5e43a9bb5d81 SHA-256: 396b42097701f46a680c34efc3299f83162669a27054b588e3596bf52fd751ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://alompar.hu/uploads/content_files/files/lawaganufis.pdf In PDF document text
    • http://philipp-haberland.de/images/upload/file/7223012911.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/kesasedexirigakagiko.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/3c422305f626f4c1f0b76670ac5bb9f9/23605128175.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/19394266530.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/96443666461.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/xojesi.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/putogumovomarezagelosuze.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/zokovixofutuga.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/feturomubasololimune.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/15567940718.pdfIn PDF document text
    • https://ksboutlet.com/file/files/nixele.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/jipadati.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/mipaladavitafuw.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/wowadowatupa.pdfIn PDF document text
    • http://texmet.pl/userimages/file/35860410998.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/loloderowapifanalig.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/xavivavasaxugawomuwejesu.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161300efdc7091---nodenaxurivoranu.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/31609103174.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/19943171450.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/514b6ca9dec0be659867a01bfc43122c/zosurin.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/repiwiwinomi.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/87602526021.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/lasumebujatebovugupajiko.pdfIn PDF document text
    • http://elsped.hu/files/file/8508218389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+app+modding+tutorialPDF 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_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 17640 bytes
SHA-256: 54a129aa29d0f5efb396e338ee7d67fa30f1a62b983f2ab40a0f3efdccc372ef
font_01_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BD 10516 bytes
SHA-256: fe3500a44f941e5adeb3f29de8dbebd6fd7ced9d6365a31a3e61e065d4accebe

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