Malicious PDF — malware analysis report

Static analysis result for SHA-256 379a09afb2bab9b3…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 22:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30450d6ccd42aab0b554ce17549a9501 SHA-1: b46c08b1462eedaf37afcf10e3c6a24fb7c7f6bf SHA-256: 379a09afb2bab9b3de03fb973afe206aaf4bee743672210a5117e0343b30281b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160791746d3a51---82965890094.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160876faa0ab44---suketoz.pdf
    • http://bkdesign.ee/userfiles/file/fegupifipapawujisofalegom.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aba7926ffa1---zuxozusagewolesupekobapog.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087444da68ea---fisenulaluze.pdf
    • http://bmcnx.com/userfiles/file/23111435352.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a72e39a97072fc123ce3ab6a2e2f57a/61557828956.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607307652792a---sozejiruviz.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c8862ce12---70312824940.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160703033b64c1---44767386380.pdf
    • https://zebcom.in/userfiles/file/18800723118.pdf
    • http://cs-web-design.de/ablage/userfiles/files/megolagipefa.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/33c79c5d11af5647d03308e96725ff37/piwot.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607963dfe34b2---rurakesijisanuxub.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c37453b0229174038b8a636779039245/dazinakewodeb.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/432760627963f432b2be6015d226858e/31654142818.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/0aae333cb3e18fa3362ef5ab7b11e8a1/550925106.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/potefus.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b08cea25e---26924921627.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/067e3c980e40c026e28b65f1830ba272/majidasodalage.pdf
    • http://selfmadefilms.nl/userfiles/files/joxibokuwodotazuwebaruluf.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f722e55a6---18078883382.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/onp6vcr2hckr0009ng6eb4qi1p/88648897189.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=execution+cycle+in+computer+architecture
    • 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_off0000edc1.bin
903485568d505ab9df5773b05812349c1f4b5d234ce1e3d6f90c0d846f8b887c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 16712 bytes
font_01_sfnt_off00011971.bin
393c4ca3cf08590825c57e52720011d39d4426f8b430b94a471979769687fd48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11971 10772 bytes
font_02_sfnt_off00013207.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13207 16792 bytes

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