Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b0a499982998f1…

MALICIOUS

PDF

89.6 KB Created: 2021-07-02 21:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f0417b07a3c9485d83cfd0a9d82159f2 SHA-1: 6d48cc6b6d62d8fce35feb5de9e100d16f929d46 SHA-256: d6b0a499982998f13f4ad512dcf37f2da8d64e1bcda5b35a114f9f992c6d5f62
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://acrgroup.nl/userfiles/file/71180086490.pdf In PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/lt646hsinhu8p07g2coea3s2v0/60294694577.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/rnnlnk9f0spgigq5t017oqru72/duxuxijisi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/40da6341f5530d4e365cd4c7bbb79263/33063759842.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d3dd217998d---19274690745.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4463e895f---dixavasubevojumige.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160883389ad71d---80780145361.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/13581043995.pdfIn PDF document text
    • https://dineflon.com//files/fenemoxumo.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/74329003760.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/waromapajutudamogufuno.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/047c073b6d4738382f1f004d36363f8b/sexamejozurosakixuzov.pdfIn PDF document text
    • https://computerzone.pk/file/84451351654.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086d7d5b821e---jomajiramexifitaf.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/xukalivuxifobaliligej.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee0d87da8a---kigunumivumexar.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/bawejofuzuza.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/4b817547f76de2d4a1b68eef3837708d/76213446678.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/97250154187.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/8a95086face61c3be4291b5fce0932f6/goxerobejikinujutepune.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/zetawuvemelejegusatove.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32c199c9bc---tawubevifam.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/obi2rolpfcd8ob63hj54jv1bb8/dapabutobama.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/37af5bae8f88aa1f4f0d9d7179eeb46d/pufofig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+purpose+and+structure+of+the+declaration+of+independencePDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 10812 bytes
SHA-256: 7609b3a425a1e213104a3af920d278842372956767196d43c662c991e402409b
font_01_sfnt_off00011577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 16556 bytes
SHA-256: 25942b1e22d522540d1edbb4116c29142e4c6652477dacb21e07eb396ee7f727
font_02_sfnt_off00014039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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