Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebe03c6c2897bb6…

MALICIOUS

PDF

76.0 KB Created: 2021-08-18 16:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d3f21f4eb2f6dbebd151735ec971fcd SHA-1: b98d10e432d0667f21fa578befba5ab28283ff34 SHA-256: 1ebe03c6c2897bb66030dc5bcdfc81c47c1b301de6d4da2486d7c6eb769152cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/5i16nao7g7psgou68m732ar4ef/92910201092.pdf In PDF document text
    • http://murphysbeads.com/clients/54316/File/61179561699.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/walipevazepipejik.pdfIn PDF document text
    • http://newmob.it/userfiles/files/wonexerenanadunurukona.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/490aa6ac0d4317815e22eb0020f1cc30/53405111503.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160988e27bedc0---93767708496.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d964310e023b7a16c944a9ad17c0dfe1/tanakokisalowar.pdfIn PDF document text
    • https://megashina24.ru/files/files/1950183119.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6c911ad1---63556648738.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/lijabuxabafevujuzenadi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611ae1ef2731d---75959873731.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/a8a47a561a8c40b3490d64875ec65a52/80737401859.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5ae452fed---jadetenoz.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/3b1a873b68a6cc151e0bfaa66e39bf62/gatuvemufofuwep.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/176988805260897fffef436.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad6159b8b0---57468728422.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fc16d039b---vibisevakoxurig.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/46828842333.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f22ecf026---divafajigitimazekibi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2vjf3e6qo6778mn491m5okn6l1/sivavanej.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/kakodekutejafu.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/71210546247.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/cdfe5506c01fce8cbc92fc5b61aab8b9/81539538800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=aashto+roadside+design+guide+2019PDF 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_off0000c673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 11024 bytes
SHA-256: 2b780900b41c32dc16b154827db4fbcf60a7f2d48519a63c0b16cfb8fcdf53ee
font_02_sfnt_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 16300 bytes
SHA-256: 3e3579d5175fb6da634f22082b8a8563aab96de0e5a8d0c46a9891938e74cdfd

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