Malicious PDF — malware analysis report

Static analysis result for SHA-256 f462d45e718b8214…

MALICIOUS

PDF

95.9 KB Created: 2021-08-11 22:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bedec873af16e61f7a9feef904ca707c SHA-1: c6db076f80a1b4ae46c9d3d2e6e4495e377bafec SHA-256: f462d45e718b82141ca30080d05d2a09e5054f7844cfe46853c0c7f768fee295
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised WordPress upload directories, suggesting a potential distribution point for malicious content or phishing lures. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://irepairplus.nl/app/webroot/files/userfiles/files/vulikeb.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a48be86a3---12763997465.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/lelezotomubifusofidi.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/vezolujomeruzibataxujax.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d5fcd0146---25118098416.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/85449029461.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/47734057327.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/duvepuzaluvokigefobedipo.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/38777159360.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/89264778292.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/tegevorovijetu.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/fupirojipas.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/m26gjahk8srsqv22n7hp51q222/48792844362.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/83292580517.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608418908fc68---ninajusotefetusarut.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac32bb3d6---81578570267.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ni1kcj2tpnluif7agq5ph73701/54355047483.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b60655452a---fufetezobilu.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/67988201634.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/19427862903.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/xezanubudepakoguxigagox.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/okjegk0f70412m02nl7m65ohg2/34275138308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+is+purpose+of+manifoldPDF 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_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B31 17468 bytes
SHA-256: 98c29232c991e6e6a72670bbe3811e6292d4d0612f9cb6f0c454880cfcc0dbe8
font_02_sfnt_off000158b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B6 10856 bytes
SHA-256: 2414069f1c5db91e4c4f4f1a488e48cc09b5d731c8fe55b159a20c311ad42d71

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