Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c716b83c69c596…

MALICIOUS

PDF

88.1 KB Created: 2021-08-02 05:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29feaeb374deb635872566dcce0f0654 SHA-1: aff1fdafc2b1f1a82843eefc92823a80884c7c63 SHA-256: 26c716b83c69c59635311c98166b2f4976911991acf0613c2380286177036cfc
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm. The presence of a security bypass instruction further supports its malicious nature, as it attempts to trick the user into disabling security measures. The file's structure and numerous external links align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://buddhavehicle.com/userfiles/file/tataxodujabejasojidi.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3bf5d3731f3df0e08601279ab085cee2/fabezelux.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d82e306d1a278449a2ec403208a6776d/10064999587.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-5/20210505100219248208.pdf
    • http://allycatering.com/userfiles/26881082031.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdef9ecba3---74003731097.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b3f6c11057fada23086c0893a4bd0fc9/15002293424.pdf
    • https://fertilizerproductionprocess.com/d/files/pesej.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a68c164a8---1479339658.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/222d77a16196e0a2e058e49babe92332/87885915869.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/cl7kip2mi0v6gdtfqlch2r1pq6/xofidam.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075038213b1e---22920480407.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1945577ae2f2a117b6b410b42d8f9e0f/dilupaxolon.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d331f9f0aa---xagivut.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/nuwuxipipunuxisilewaja.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/jtq9bt763757lvkt9q95u8q0oa/fiwonederilubupegevix.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8feaf06056f78b0ffb1ec14b2875a253/jimixegu.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/5a2c9e5912bc828bcce7a467c1e72291/xidefikisojabuxu.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8ffbaa0c90525c58303a86fcce1ab065/4697264306.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5cc1ae6964c29476287c4ae054469beb/vikulamipuwumofijelazu.pdf
    • https://alusol-kw.com/ckfinder/userfiles/files/zekajunejenujarebifagejog.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/cce412418a18b29c8e3d1b68770529d9/nekejeburonune.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16248611479027.pdf
    • http://stroi-sistema.ru/img/70497983963.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+download+epson+l380+adjustment+program
    • 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_off0000f0ce.bin
c7286bc4761e0d56822079eb333e633863b99ec81c1b7ef114fa28aef21813b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 17492 bytes
font_01_sfnt_off00011e5b.bin
a33a183f550aaa32d3930541aa58fc262f123e1fc33dc15fcebd0c4970f9ec8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5B 11452 bytes
font_02_sfnt_off00013940.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13940 16792 bytes