Malicious PDF — malware analysis report

Static analysis result for SHA-256 d567453ab6158448…

MALICIOUS

PDF

96.8 KB Created: 2021-06-26 03:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2004483d8b56eda00643bcc946cfb34 SHA-1: 01d4b679cd8bdd3f229134165fbc2592edaef29f SHA-256: d567453ab6158448286d498f857ce035bba0cb6ad97725999bde6f3c9a2fdadf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://philabc.ru/uplcv?utm_term=job+interview+best+answers+to+questions
    • https://tlproduct.com/userfiles/file/85144024.pdf
    • https://mytopics.it/uploads/file/76043982623.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083d8b643020---gurisikibinatini.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16082bbbfeaf71---39949601962.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/60fc7e8debe184c082d549580303751c/vevunibokiditajakegag.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20229353d---74108062612.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/19475933340.pdf
    • http://wienbildarchiv.com/upload_files/files/jamisojakadi.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73acb0ef94---804711033.pdf
    • http://kayapaliinsaat.net/file/lepebopasopux.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/1268b3lc7iqi23alj5kljh812e/zipomapakonut.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608377d1e43f9---zevumorijonuxu.pdf
    • http://selfmadefilms.nl/userfiles/files/51237552306.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/40f2459df0b7885023174d78ffcbad3d/zebubeberozoxofodekiwuf.pdf
    • http://meble-tk.pl/userfiles/file/biguvowufezegexopi.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b2231a35f6393a30f0472bc79866ce78/47436824128.pdf
    • http://anatolianlgs.com/userfiles/file/dosawuporiz.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/tomuz.pdf
    • https://walkandsmile.com/userfiles/file/41179485355.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a092cd754c---parijepuwuvibefewejo.pdf
    • http://architettoangeli.it/userfiles/files/93422849723.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/dcda5a8473c428aa6525f814059394a5/81409058757.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119fd.bin
44bfbcc2ca82b5c3440848ed4f05cc54fa7571c44c1716d56471659c1b5d378d
pdf-font-stream PDF embedded font (sfnt) at offset 0x119FD 10584 bytes
font_01_sfnt_off00013264.bin
74239be14394ed40012843a2fdbe913772b9f047821d34dd2f2038d6a6538c8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13264 16836 bytes
font_02_sfnt_off00015e0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0F 16792 bytes