Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c80779a8b07d4a1…

MALICIOUS

PDF

110.0 KB Created: 2021-07-22 11:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f4af9280b7859ed1f7964fed43104908 SHA-1: 86b7471b6378766dbab0a6696a89526f589d7a53 SHA-256: 3c80779a8b07d4a177d3cb1779f04bec0e6ad0f28f75f057ff4e7d0ab745823e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9470

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.blueoak.fr/image/file/12151619341.pdf In PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed1ecad95---85350959641.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/kosolabokivokebon.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/40f8901416a6933938033469a3c98495/57264651624.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/094f2a8cf5e26494497ce450def695db/vufujuzaxupufofo.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/43778515546.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/50975468517.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090e3035a60f---rukepuvisivesoli.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/84543591585.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/97014882185.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210617112730539.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/81bjl4ku0lm90ns0387l00l1v7/19738355483.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/mimezi.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16071fcf1a6cf2---4868918936.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/woninazufukemifovugufud.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/suk43inan7661hp6pev85pjaub/57363390437.pdfIn PDF document text
    • http://artospace.com/pics/file/mokedom.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/s3j98db4i8jtrco9kg7qgnc436/15008938359.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/93351004441.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/23f21bfc812374d25b1df3331f7d0fce/logadu.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/nurekasilemexifididiliru.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b48cd2b3---61119111555.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/2a5d9f63518cdc85ee7fe63141046dde/ropejagomareropiz.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c158b9cb5dc---22862308457.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/3930935157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=c%23+typeof+nullablePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/21dfc2fb03c04da2ca363176dfea0b51/rexiradetujajo.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 31952 bytes
SHA-256: 7c13b043819504f59002ff87a3694b9906718fb0770783270d5910c2d616e65d
font_01_sfnt_off00015efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EFE 16984 bytes
SHA-256: fa133159517f2a6d0f2f6931ee77b5db1d69995af6ad61ccf6e639b7a049a06b
font_02_sfnt_off000177f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001900f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1900F 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_04_sfnt_off0001a2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2A9 928 bytes
SHA-256: 3c15da991b16fcc268d8d33266f0982d2616c8d8d09e4e64322fdaef7a2d7494

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