Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d71ff985ba2c0a0…

MALICIOUS

PDF

92.9 KB Created: 2021-07-29 22:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc0b89eb93dd744f9b4fede6412aade3 SHA-1: 057849a3adcb044fc650adbeac13254c6207982e SHA-256: 0d71ff985ba2c0a0dc85d2cfc4f202456eb53647b4ace70806a7427c71aa7192
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it functions as a link farm or phishing lure. The presence of external URIs and link farms on disposable hosting points to a campaign distributing malicious content or attempting to redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://catamma.ru/uplcv?utm_term=libro+caballo+de+troya+7+para+leer+pdf PDF link annotation
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45e7d1498---35067671477.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16085d05daf600---jebol.pdfIn PDF document text
    • http://kasargod.net/uploads/file/98662501609.pdfIn PDF document text
    • https://afayl.com/userfiles/file/45623281188.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a92071cf454b6787ce288dc22495ec83/kexina.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/69512663387.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948fdfe1726---69700995281.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dcf943221---vodel.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/pquf6eochtpiqudejbh2n7f37a/87701919164.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/weromuwuvujawijirunuza.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9110bc3f8---12259612633.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd27080c166---fepijeweribibejonoril.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/90898990146.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210616060919.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/53530371222.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/61100979856.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/b41e5418448131f4f2d6285e7641f6b6/wogubekonobagipisuxojesu.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/16af601cdd1ce13fa4c1fbc71bca1b79/virosetidukepenukav.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/37279630853.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/34412791156.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///vasugapenebovupakafokibe.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fb8b9d6e79d3e905ab3e5ab6795d8612/xusopakumuguzuvur.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9e2b943d5---2760939710.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/15478962037.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8344051a444007a48e393e10f4e4fce5/giralejesunifi.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_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 18996 bytes
SHA-256: df8cd141743016c8842e8246571a18e2eef7703ad6c2c83a00a547898a25d299
font_01_sfnt_off00013269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13269 10600 bytes
SHA-256: 9f58b20e6b7843832f5aa7c39975601817a83e94b62128a22621a5ffbc79bf00
font_02_sfnt_off00014a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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