Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d308ca81865698…

MALICIOUS

PDF

131.4 KB Created: 2021-06-30 08:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d770fa59380df41c5aa08d236479f5ec SHA-1: 095242cc8d8c2d33f95a49650f61671c32790dc4 SHA-256: 90d308ca818656984157590fd370edd71c6e71e743c954af00c532f35cee3569
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm containing numerous external URIs, many hosted on compromised CMS upload directories or disposable domains. The primary function appears to be redirecting users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/28moo10cndl53jotg5sb5n130d/31332209136.pdf In PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/lodizajexosekige.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/10970c770d1778ec1448f29a77313f53/zeporujusof.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/54608594912.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/64db491f7b566c9414c6ece06df8ea11/fulavaveropegoxatogiwoxi.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/vbb58coc7vm8ur9t55isf1mtm0/14088535211.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a2d823eaa---65905640670.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lunapil.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/4a560508e3bb75d9349288c55cdc5b8e/korisiw.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/binepurowonaj.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/27162776939.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a38b86bd5cfd215aefb94e540a699d06/56022333557.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1k614f9snnm0hj10smn82l9927/86095775659.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b1034bba6a54c190da00bcd0221f704f/mapojadexanavujazat.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/42357826519.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/jufvf8mf4crej5tnc2nurqkrtq/xokugomajuronexuz.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/muwif.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9cb883e51---bimejenodejegasi.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/mezebuturogetorotupixose.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be3ace46119---47869775628.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/wipusuvisuti.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079355d232af---kalaxikidono.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9b7ddedd---ninabowuganofudivevuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=meaning+of+generalisabilityPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b361a687b---49094968351.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001971a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1971A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001af27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF27 2112 bytes
SHA-256: 372447d7272d8d49c6fdb4b543547a968d1b4fd7146c711002f5a4c572db5c9b
font_02_sfnt_off0001b8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8A8 17688 bytes
SHA-256: 21a120f3aff531aafad48890a4e22a22f0e857a315f4ebbb65589f3fd3d46a1e
font_03_sfnt_off0001e6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6F9 10636 bytes
SHA-256: 6a4739a939e4f494bb646ef4f0568e025d654d9d4bbeefe5f04b6566537896ab