Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8c7348739f1a90…

MALICIOUS

PDF

90.5 KB Created: 2021-06-29 20:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18779a871b9e0deb8a793c600a88bf2d SHA-1: f4975026bd5e5c074dd96bf41ef797dde22bd5f4 SHA-256: 5f8c7348739f1a901c12db7d2f71e997fabfb8a9eb4b777ebf8805ed2b55d04d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV specifically flagging it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious payloads, indicating a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://oniceh.ru/uplcv?utm_term=davit+launched+lifeboat+procedure
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/d57ffb66f380077a7b81f39715c80858/firenoketububiratilenaxos.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/e440e085cbe74797acd10fe4ccd1438b/3853059898.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/46e9da4eba42071419c0fccbe4c26796/niwisutogisexusuja.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/460a7d89cd812a2a291214cc8419458b/17088311239.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/shr3e4vli46csvb8i4b5sua6q7/dilufogufa.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/t95ef52atcqi3hkcmc074nkcu4/4921840275.pdf
    • http://zkojicin.cz/userfiles/file/74288580167.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdd5151f72---42881594138.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/56210045983.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/57442972509.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c6701e3c95e---81109626048.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7477529e---15937108665.pdf
    • https://ngonluathan.vn/images/ckeditor/files/wokufadibonuverofij.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/e8s4tee9mf67466l16l7lirsaa/bigofanepinipaximofupebap.pdf
    • https://ville-saintleonard.fr/pdf/82357747187.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760794dd584---degaradodup.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/7263344533.pdf
    • http://www.toeterloeh44.de/files/97300818818.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f68c222ee---54879651789.pdf
    • http://ateliergermain.net/sites/default/files/file/16620380363.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4508e20bb1b2ef2029f45a491918202e/dexivezutokebi.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/0mtc2itob3rv0di946frnml7h3/tojiregozur.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080777295923---dukolidelufedisujulala.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1e4664c8e08e76154a8165f22a29f5ee/26412144667.pdf
    • https://htddienstverlening.nl/userfiles/file/mugoduxenejivobetebo.pdf
    • https://betalinktech.com/blmedia/file/34420731181.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd6051c170---wazonemojolaz.pdf
    • 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_off0000fcd9.bin
378312f0d349af7f3dfc5624b7570875f44948c54cda454228da05c44946c706
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD9 10856 bytes
font_01_sfnt_off0001159f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1159F 16792 bytes
font_02_sfnt_off00012db1.bin
ad1fa4cfac88e8920ffe15d181dcb14d863f7486be042385c553369b6b5783f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB1 17312 bytes