Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b24662ef685899…

MALICIOUS

PDF

86.7 KB Created: 2021-07-02 05:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7c3d68ff62c587ddef930c1c7cb11fe SHA-1: d55ef0fc1a12919983aad7ea797c55c5746a5e18 SHA-256: 50b24662ef685899dfdf59793e902a9422d9a38a0c3d46374e68995e3cd0c32d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

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 https://philabc.ru/uplcv?utm_term=bright+and+dark+side+quotes
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/538c95d095798cab3b35f09e35cacdbb/70797140511.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c6e421ac1---diwalerojasarof.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722e31b1040---83439240336.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc348558c---54520913451.pdf
    • https://karinbentum.nl/uploads/file/naposonubepu.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/29745124847.pdf
    • https://travelstore.tn/userfiles/file/96776435384.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b87a5d1cc---megawogegetojo.pdf
    • http://stadion-zarya.ru/ckfinder/userfiles/files/xibijivejope.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075584c15a51---lezazeguxuwabagi.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/9bd75911ed9de2491fbb53f12dc70b6b/sofuj.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-7-2/20210702100534607642.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/78ga29ss7e3ipdhfl8gbg989go/50137690718.pdf
    • https://groupunsur4.com/contents//files/zatupapigubafib.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2p86j5kplhns6cd46c45736ul1/bametagaxizobidifozam.pdf
    • http://aep-tc.com/cache/fck_files/file/wapepurujibupukafex.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/bgdpe17qvib5p2k80frm6osgd7/54552489653.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16214485249337.pdf
    • http://nowyhotelik.pl/userfiles/file/27094347406.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747abb206cd---nowibujafawotif.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c7b7a572d2a5bed1ff13dbc3f0210a66/43774955068.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/17465492056.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e911254582---dixebezawijawubul.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c473307204---32950138220.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079ddf8573c7---fafewetipupuronibegi.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_off0000eeb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 16792 bytes
font_01_sfnt_off000106c7.bin
bf740ae38c92ff4b3fcc30e2db28b1de6318f0f800457092310b753789330eb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 17184 bytes
font_02_sfnt_off0001336f.bin
57a4b3e05bc6ee3d42948ba3cfe26c6df71d63203a608d85918041a27f990df1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1336F 10872 bytes