Malicious PDF — malware analysis report

Static analysis result for SHA-256 4766054810e54e14…

MALICIOUS

PDF

90.6 KB Created: 2021-06-30 03:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d90df7275c9be81328765e176e4842e1 SHA-1: 92bd0018ec577dfbbde99257894f089204454a01 SHA-256: 4766054810e54e140580c1f854c0ce549c116450f2921805c3ea6fbc79da5e83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://teraval.cz/res/file/43912285789.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/366uqbn3a5b1cus1jnm97h6g65/23338914618.pdf
    • http://yjsyrj.com/userfiles/file/71675779442.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/5d07fud0ib6k53n7hlprg5df3o/69883148476.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4a982d26---41477278971.pdf
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/68639269089.pdf
    • http://kashima.cc/userfiles/file/27181122529.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a819807f75b---finolilojowu.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0599b68d8e---3917344410.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/kddi72tn1s6hc8cs3tdrd16rl7/35299104470.pdf
    • http://handbook.hu/upload/page/file/midozijabipad.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2576105cd---judoxududaf.pdf
    • https://davaocarrental.com/images/file/xegamogumevewodu.pdf
    • https://amursvoidom.ru/media/files/risubapagi.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c6634187864---bomevedadibikijutakiminu.pdf
    • https://medtek.vn/storage/file/73368905283.pdf
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/dixobapaw.pdf
    • http://belgium-ex.com/images/blog//file/29853922690.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6906bcbe5---87864641500.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/46507331751.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd992e5f78---konasodima.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966438d8d71---15264443783.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2d084f2f---16246723379.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f36241749---pupidobidadinan.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=qc+to+baguio
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a428a32d3---83675665995.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_off0000ffb5.bin
5b7c89f47f192505ee4e367707244f2c6814140b9a66bb992689ea8fce86b0cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 17728 bytes
font_01_sfnt_off00012e60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E60 16792 bytes
font_02_sfnt_off00014677.bin
ea6a1c31afaa2cb815f9afc576351e976b4d1394e747753c63342de242046106
pdf-font-stream PDF embedded font (sfnt) at offset 0x14677 10152 bytes