Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53f6b68a39dd9a6…

MALICIOUS

PDF

72.5 KB Created: 2021-05-07 06:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55304b6d5a24f7f0caee3fe54761b3b7 SHA-1: 5e4d85e5edf26cbe9132cbc3fc680448e49986be SHA-256: d53f6b68a39dd9a619cdd0eb1d5fda5a52edab231bb8e6942d6f3cb1ed2ec619
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. Although no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests the document is designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae39e3f0c---10094542000.pdf
    • https://anmoul.com/userfiles/file/zukobeg.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/797c3dbebef2b949d38a86213c107b73/vuzafozaxijezafozurifus.pdf
    • http://teplospectr.ru/images/files/42286003289.pdf
    • http://allmedicus.com/userfiles/file/kolawokobakamufo.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/e4504ff6a2c301497af8dc08abd4c752/69496635406.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/e8bc3a67e948ff79f06f25a4fd8eb2af/kemuxagamogadakuwilujeto.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78efd9c18---15726346753.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/ludoxa.pdf
    • http://beiks.info/public/file/46266430449.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609323c23154e---34133464581.pdf
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/7672i1eogb4tmvbl9bj2e1581p/gozepafamuxiwi.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ceb4a899---25843336738.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb486a0798---figugiri.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/4d25ce1901738ce0c2b52ff481f02fd8/8522927186.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4d7132cf---87272124346.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160828a78541e7---42761206416.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/b9fcf884033440eead596c553c69c64e/nefuliwesa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=baptiste+bbc+episode+guide
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd6.bin
c18031a4a05b534890d7f92160a0b1fb06dfa9b2246dd29ceada4c76c4bca2dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 5300 bytes
font_01_sfnt_off0000efe8.bin
e8a252fc9242a3096279e8f3d8a792f789035d7c415a1eee6c4dc025e2f5e805
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 10992 bytes