Malicious PDF — malware analysis report

Static analysis result for SHA-256 9293a08f06a72611…

MALICIOUS

PDF

89.4 KB Created: 2021-07-06 00:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8cc8f3c49e84950d5ec507b043d1c25f SHA-1: b5194096ce49afb10caf3acdb64f92d283a454fa SHA-256: 9293a08f06a72611f1fbb2423b59bd56f13e8ffff4ad247e27773ebabc8ed0a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the presence of numerous links to potentially malicious sites supports the phishing and malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe9acb4b4d---wewusepufazimu.pdf In PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a73576223b---filafikigavevitazijodemuw.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/76217638151.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a725d77e1ae---tunabinilufakana.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42da623cc---84777266726.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/8351226429.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a33d535ad9c91fb156328132f3dc7512/rijolusujibiletexugolo.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/wimopejuzojafugubexij.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/xewepaponoxinifet.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/75nvmau7c63qksdft45v5k0pf5/47887591647.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3796c16f60---82179014497.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5f0494eb---jesodenakuku.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/380c36cc83552a48315fa70f8c28f9b0/50771733418.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/sunesarud.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/84234258157.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb2ef1d343---wekowit.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/42961902838.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/kuxadokatufijupe.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/lofetaxet.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f4785ca1eeecb5cce29935807ed80fb0/96513389969.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e27b541d3da---gejilenezomebagawom.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/fakupixadosumovowozakifev.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/cb3082d91bfb41b978aa3d2084285883/molinimasukokubesip.pdfIn PDF document text
    • https://anakmeong.com/contents//files/vamipajom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=field+hockey+quiz+questions+and+answersPDF 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_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001130e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 11040 bytes
SHA-256: fccc27c57a5aec6058102e34a1d8db41ddd7026f5fbcce28a3d48af5055cf576
font_02_sfnt_off00012c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C97 16760 bytes
SHA-256: cb3ff9305d8c3e1859cf260364aa584d04264423dfd6c1be12ccc2986a08691e

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