Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc4aee9bc308e00…

MALICIOUS

PDF

94.8 KB Created: 2021-06-26 03:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdeb00839e8961a0a7bd3b0d26a03ac9 SHA-1: e7cfa589727ef6b1316d76633d7e3fcc9edba04c SHA-256: fdc4aee9bc308e0009ac5f041b8c62bacc839bea1dbd5c2f8e8ac11e62713920
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content, likely exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ea531d8aa1c9de17811e8cac11f73dfd/lofurereto.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/aa8a9851a54027b670933b9ef1c9bda4/jojetamexosuxobazukep.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5b73e3fdf60a2489f009939ee32d9ce3/tasimejewitinubimojaduluj.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b05d293d0---41660393588.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25288128e1---rewinavezodub.pdf
    • http://villa-carlshorst.de/sites/default/files/file/71305606800.pdf
    • https://karinbentum.nl/uploads/file/36103090382.pdf
    • http://anatolianlgs.com/userfiles/file/rigutu.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9071991d00---varesalotowiba.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c985baf0---62787379083.pdf
    • http://esoftland.com/userfiles/file/82671717296.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb140b70ea7---solenovurifawatis.pdf
    • http://ibtaker.ps/userfiles/file/powikub.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/aankvhd2js3l14ms741simqm3v/28622888307.pdf
    • http://diysmart.net/userfiles/file/50215441972.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0bb12ebb---bokowe.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9e9373316df3297257c152bc593b3fa4/55081895899.pdf
    • http://valsadindustries.com/userfiles/file/wagibibibitaxamonogop.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aa19b5fe5---16131077478.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a7e817950f0a5e14f74ac2538938d1cb/92608295046.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e27e572f7---67999915393.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/zasiwelesasugivodobag.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081c03caf4cc---xilikuwevuvewosikave.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e337ac59c19d2c572f68712af92cec52/gixisirapux.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/724caeb12da7a57c8211273265dc778f/51421399290.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=interjection+of+mild+disgust
    • 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_off0001122b.bin
3450034b6406d4576da88f65d6509cd2f0e460db1cc711e69237d8093e44f409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1122B 16584 bytes
font_01_sfnt_off00013cde.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDE 16792 bytes
font_02_sfnt_off000154f5.bin
bac1e1dab14301cb5947901eb25098012994f44be0ec04940afb1d8172795643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154F5 10840 bytes

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