Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f52cb083a53568b…

MALICIOUS

PDF

125.4 KB Created: 2021-09-05 04:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 80ca772fc196b9b1302196c4401b7580 SHA-1: 717cfa5b77c01e6f8266a6453ffd3e31144ccc25 SHA-256: 0f52cb083a53568be28c1154a0d04cc06bf85fcf65c9c0f9fc9141bd9062358b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to lure victims to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://infrive.ru/uplcv?utm_term=desarrollo+cognitivo+libro+pdf PDF link annotation
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b64153731---16352665835.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160abbfa9e1214---92960960488.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d352141dcb0279447b0d57b53b1c52e2/92375509620.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d571b0d141e---nadimuvefibet.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c884bc1f064---97439350452.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/45249853743.pdfIn PDF document text
    • https://digireg.se/upload/xuvobugogizovimefajokume.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/2585837452.pdfIn PDF document text
    • http://candientuvibra.com/images/file/fariguwomobof.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160876e685d999---siginazuwa.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/vesolegewe.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/10345971770.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/q9iv4g8nr7hl6dk3rjfr5lehg5/60758100448.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/5463938913.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/pizid.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/j0c3kqfqlllmd8hsqlgp3audbc/tonorifebigowiwij.pdfIn PDF document text
    • https://t2sc.me/userfiles/jezoribof.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/57120580490.pdfIn PDF document text
    • https://kopari.hu/files/file/64655519125.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/npspfin9ip46sin478lk7rdgcp/71229239681.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c21e5b660cc---74913029100.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/92421803699.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/xakalelegumifeneb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000183f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183F7 19832 bytes
SHA-256: f228c3420c65b42c0f9c3f947995c7ed9b6ad750cbd422c064634ec863ceb717
font_01_sfnt_off0001b676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B676 11000 bytes
SHA-256: 327c0b8cd9e81f715935d35a989f9559dc947b03d116a39eb9dc8189abb56f14
font_02_sfnt_off0001cfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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