Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c2940cd2966ff7…

MALICIOUS

PDF

85.6 KB Created: 2021-06-25 12:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f59cd785d6bb01abfaf26fb27733a52c SHA-1: 5b9c68448de7cb669f76f978145193a2bb94ac9d SHA-256: c9c2940cd2966ff7b222e333f54ef984bc8023124c61eb8d517f2a16afedd36b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://queure.ru/uplcv?utm_term=my+platelets+are+low PDF link annotation
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b48551c65e1---41622465792.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/60509385731.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ca96dbbb7416088298a299a25ff00167/7189759786.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c38c22a983---buvopevuxarawide.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/85186105308.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e97e1b68033b8ae9e531f84e27544119/50946287290.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608624a6d4c05---buzuv.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/tonari.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090979682f3f---koruluwusijokafidorado.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e915f1e28ace6754a784f93c492eb120/71465004841.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/emqtmvrk805o7ttiufl8nh4gna/3017861400.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1140r49bcbadm0psp5gjmgajos/78034423072.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f2e1b1a765a99c1a06c64d589ce0febc/desibejigipe.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4612b0e66523ca8e499a578db2a1dd9c/38601750576.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/nowiremosulidifusen.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/dopedajokisus.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080c8fe7526a---tipisonitupatenabato.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719009a01db---pojoxe.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/nijuvexexevumawo.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_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 10240 bytes
SHA-256: ffec2ad694d7ea832fa600780ccbdd3634881de799fb2d5c0c3e3e01d8bc62da
font_01_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 17484 bytes
SHA-256: 48be12adbefd753fe01ef82ae44b1c975d250e2938f5cbe2351b13105c975ff5
font_02_sfnt_off0001316f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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