Malicious PDF — malware analysis report

Static analysis result for SHA-256 937f76e0d6289cda…

MALICIOUS

PDF

90.0 KB Created: 2021-07-30 10:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3331ed5e667aa58cebcbfe996c2a2d7f SHA-1: ffff5af06ab811f37d47e5c1af40547736d79bda SHA-256: 937f76e0d6289cda74cac0ab802e4e082708e47282088130808315dfd220a8b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent to trick users into downloading malware or visiting phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc344c489---jonejuk.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2495a44bda98e46afba0d4e64725ca00/sofusenefagurisi.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/35ebea6dbdf44ae2560b715287d2dd89/14731015197.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160900008e373b---95034161647.pdf
    • http://detikakdeti.ru/img/file/15433324191.pdf
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/povazezejixixos.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/db73c64177ab31281fd69fb805b21642/kozodesudetakexonakavov.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160aff2464a093---32588171481.pdf
    • http://trungtinjsc.vn/upload/FCK/file/jikofowidugewiritimo.pdf
    • https://pinkrali.com/calisma2/files/uploads/jirudakukirezikesi.pdf
    • http://shengnabei.com/uploadfile/file///2021071811271355.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/db8e76e62a18166c89fcc10f6c56e29d/laxofatufoz.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092baa4ecbaa---tobozabufobaditav.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609306773d7aa---47398798782.pdf
    • http://yossy.biz/userfiles/file/zibasaxosapifizamud.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dabc65d51c---80442158434.pdf
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/wozerukasimesadilitol.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5dd93ac348fdf5b0f43d7bc6dc903b11/zalik.pdf
    • https://cremyco.com/app/webroot/docs/file/17618570816.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/47903176861.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076228700616---rupizupururidu.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608502c3de661---wujibujularilanovi.pdf
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/41659724890.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/55567fa400ce22e00d6c308a980e22b3/jezadufudinuzukajib.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+monkey%27s+paw+commonlit+answer+key+quizlet
    • 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_off0000f9d3.bin
0a50650d2edb0909315b9f7cd844c9e245ab237c0bb57f94cdb2232106778d62
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 17540 bytes
font_01_sfnt_off000127ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127EC 16792 bytes
font_02_sfnt_off00014003.bin
aaf12508ace03049af156acc5638f1c4b9ee8a220a5c60682b8369785f68d11f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14003 11232 bytes