Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fe35817d2a188d…

MALICIOUS

PDF

75.3 KB Created: 2021-08-29 15:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5edaee7eddaf8a2227bd7b49739c6a54 SHA-1: 63384193cc7afee4ef59db1583023c91fb89298f SHA-256: 63fe35817d2a188d688dcaf0a38913c82524edde8eaacc2744eb8564929b56ab
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=vector+product+of+two+vectors PDF link annotation
    • http://www.hmh.sk/files/articles/file/zopevixukoxe.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/0o6q1iah4su9s8ni7pj1ru8lbd/riboxixosu.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/mai08e1cvi2p4711n377jlvush/supemikewamawedetirev.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9985f78aa085b8a533e26408a728be13/fotuni.pdfIn PDF document text
    • http://starma.pl/files/file/25146155027.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/zosejuledipiver.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5bff04179---demifonaganipiv.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/nabavuxizukurukalafozara.pdfIn PDF document text
    • https://kildevangen.dk/files/bifigosufegaxepivig.pdfIn PDF document text
    • http://gdgom.com/upload/file/210813130748410508a8xltd9a6hbo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a54312dd9---68660510852.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/miwolepudiginuleduwap.pdfIn PDF document text
    • https://luminex.pl/upload/file/perogute.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085842162685---vadujojotanugimozokipesuv.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/nugelisi.pdfIn PDF document text
    • http://ipllaser.in/uploads/57243916319.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/jurigepidofe.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/98271097756.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/kifenani.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c492824fa7f---pugid.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9054999f---16084618075.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/bj3e97thvs6h63oa6blltrd6l2/lukomije.pdfIn PDF document text
    • http://cloverdiamond.com/file/61649813515.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/292b84dbfba18d378763c22a51d1f67c/20682323341.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/najamerimetitisobotiteji.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/2628485230.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_off0000c2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BB 10428 bytes
SHA-256: fb5747c3239fc04dba6641ce26839d10651419af3eb0bd576afaa8f77ed6420f
font_01_sfnt_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 17476 bytes
SHA-256: 44dd26b3e53d2a1adb6c9c4321e996bcde7e998abf939d9afe71c982583e68e6
font_02_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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