Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f728cdd351a739c…

MALICIOUS

PDF

82.5 KB Created: 2021-06-27 01:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 992c2c48281868b97d3dd75f4abdc940 SHA-1: f9beb40929cb2dacd8c771ffb6176f35b83faa67 SHA-256: 0f728cdd351a739c5fb5083470844dcc0a99f3f9d64b74ed1473cef650ddaa5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The presence of these links suggests an attempt to distribute malicious content or redirect users to phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7581d65f1b---raxomimodopixuwapotonegup.pdf
    • http://dienlanhlongan.com/upload/files/61006213709.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cfafcf840aa---59914385586.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/8mr0pjhau60ia6k3utu1vaptp2/57380107571.pdf
    • https://stvorki.ru/files/file/tajafupexilabakisitutag.pdf
    • http://muslimofwestbengal.com/mwb/editor_upload/files/11859999388.pdf
    • http://jshanwoo.com/ckfinder/userfiles/files/28528250026.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/c541945281e8967266eff4549bff0451/suvunut.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1008b075f---vetoxujutekabutanasatora.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f6d3cc6d---vojusesuvizat.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/debb408cd475cd2f33594917e87f7e15/jedunuxevelumod.pdf
    • http://ylgems.com/file_media/file_image/file/99845916505.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082362f436d2---galetedi.pdf
    • https://sportsht.com/userfiles/file/36770189688.pdf
    • https://mytekas.com/UserFiles/file/kowenu.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/debirasozaf.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080af69265b0---murav.pdf
    • http://dokumsuzgec.com/userfiles/files/8587115993.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1e7a6eb239f3918c9e3beccdeb46e275/5313458131.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608349c2ae0ff---14217227232.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cf4e3c114---20779309107.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3dc87b88---meluvodobuzumejepenemo.pdf
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/80547072527.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1d53cdbd7e40c5e4b79335dab08cf16a/gafufejoraxevijuz.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8ec9779ca---lurajojosavepo.pdf
    • https://www.alamy.es/licenses-and-pricing/?v=1
    • https://www.alamy.es/foto-kung-fu-t
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kgf+on+tv
    • 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_off0000e0cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 16792 bytes
font_01_sfnt_off0000f8e1.bin
dbba1abb2f732b276f4495a80a1c1a88508088834c41f048d6db6b138d3d84c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 9744 bytes
font_02_sfnt_off00010e44.bin
3274a6d24dae075a1038d51188bcf74e0843731876ca75c60d0829e2d8eed4cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E44 17816 bytes

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