Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f07ca36fb4fd51b…

MALICIOUS

PDF

93.5 KB Created: 2021-09-06 15:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f0cd68b055a6ad3af9ec2f3c7c8d523 SHA-1: a2a1d9fe58669a69f0f59d8b2861b2acb15305f3 SHA-256: 5f07ca36fb4fd51ba63f9410690d39bb2e9558958fad4c2970faf4cb7e8dc19a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. Heuristics indicate these links are used for SEO manipulation and point to compromised WordPress installations, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=virtually+native+pdf+download PDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4620f73bbf7e9b918b7608978402e438/61792269910.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cab52f149a8---doforovoz.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c739eb8f7c4.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe7468974b---67375833526.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107f6a13bc59---forafew.pdfIn PDF document text
    • https://egca.fr/userfiles/file/tumizeme.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/kelarofusemireresuxuguzo.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/73572720621.pdfIn PDF document text
    • https://go2germany.ru/files/file/15727392817.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/dexezopuxodovisufagijiku.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4f1fa07ba---zuzewolo.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/takejizetowebupegajojal.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16099e8adab9e0---gifedifudewafokemijagud.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/xebovefuzaferanipabixape.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/jodeganiwejudun.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3d51989a4dfeec5165d5affccfe5ae1a/39125150137.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/46131242794.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/84196172535.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/sugodukikikadatexuwu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/u7s1q94hfdolgd8eqdof5u8ql4/48539848665.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7125a7e701---51848840631.pdfIn PDF document text
    • http://altinay-law.com/images/file/25801621160.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210725131613.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0284cc60a---14982875920.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/2158573448.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_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 19556 bytes
SHA-256: 40761eaada2a1d11e0256c3ba55bc3ece4c2ee289163e0104a32a4f9f523aa06
font_02_sfnt_off00014fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA0 10660 bytes
SHA-256: 2aac4efb7551b04275cfc086e1c5240b844401724de4d284ac238137404f71d7

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