Malicious PDF — malware analysis report

Static analysis result for SHA-256 757dc913965dc898…

MALICIOUS

PDF

86.5 KB Created: 2021-06-25 12:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 11955c9f2a49fdb3968206f5f3d697cb SHA-1: def8ec1d794bb5118e0b56d685b02faa0f1ec934 SHA-256: 757dc913965dc898fe4861ac2fad35fd35b72bd990694efeb298ec811dcc0976
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2b1jdoprkbheafi2v6klef87j3/wofadopokewobasigiwava.pdf In PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ffb2c2ba8f48fab11bd5c25b8339d8e1/getogu.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/dijuvidadaj.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9a5fb4dc0---98270413068.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/gulupetufimojiwowijo.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/wipugolapegorinu.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/kesav.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b805568f7---5595858109.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073417cba86e---41133791110.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/61719856077.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/babunazaponevulosuzedo.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4722835ed---kuduwobesudu.pdfIn PDF document text
    • http://goref.ru/files/file/896274612.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/dee9iuvpg5qnh0do3v973fe76b/81975589054.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/89702570099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=flat+sarcoid+horsePDF 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_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 10340 bytes
SHA-256: c17c6586b07484fa89fadc6cbc01f212c5d533d6cd269648b32b70adc737205a
font_02_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 17288 bytes
SHA-256: f5c415170820831bed52f4c4bc10f6211608290aa8c71ae6691ad8c44cfb4fa0

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