Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ae862bc6ffaba5…

MALICIOUS

PDF

99.1 KB Created: 2021-07-07 05:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90dee60bd3e99ce74ad3c50300424241 SHA-1: 3d9071d16319235c340f69ab545c55d07db5ecb5 SHA-256: 89ae862bc6ffaba56169ab8967ce8f495e176a4c3e3738911de940e7c5f2f49e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The presence of these links suggests an attempt to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf48f93947---konupixufulumivuseri.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0259a256ba06e767c48580630f67c199/23337728645.pdf
    • https://asiarsolutions.com/userfiles/file/pagewiturubozunisig.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b11d899dcd---mugizulupefibemaxowet.pdf
    • http://cephedanismani.com/images/pages/file/guxuzesemorawomilosapotap.pdf
    • http://studiofapas.it/userfiles/files/85827835027.pdf
    • http://aucoindeshalles.fr/menu/file/23940615363.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3da606a78---17203873848.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/7qs8rtuj0m9v5b7d95ps8m9736/43069639279.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609717b42ded4---80881704468.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db99adad203---31743683570.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/772a042a808156968609a8cd056aa355/59206931396.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9814f30b9a---39905277708.pdf
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/7947108275.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/62721127601.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837de8218c9---bomido.pdf
    • http://zxsolar.com/d/files/kizerazitat.pdf
    • http://haisushitogo.com/uploads/files/pipidozujepi.pdf
    • http://high-keenltd.com/userfiles/file/gabapo.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5f22da28c---13480669257.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/fa74feffcdecb3da78f9c74f210c0161/xajiminurakekotinot.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4273be67a8---52038469406.pdf
    • http://fitviewer.de/files/file/loteritaweguzer.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609f16ef02fec---fozatowogiko.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=made+me+chuckle
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122F2 16792 bytes
font_01_sfnt_off00013b04.bin
e6c4ad09665c2d18d161fe36528e2f484f379ed200a3d6d84d9a359c12f09de7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B04 17332 bytes
font_02_sfnt_off000168b4.bin
3b82c4cac745629dc7fc3fcb4695da4a073dde89f41696fb239bc612b3db9c9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x168B4 10140 bytes