Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3e1dabfc13dca9…

MALICIOUS

PDF

84.8 KB Created: 2021-07-05 14:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb766f7f085f4ba5d27fc3ab5eca6af1 SHA-1: 2f7739fb283d302f9cec8c5f41b6c4ef3b019de4 SHA-256: 7a3e1dabfc13dca9be16481a3154119cd71f80b69a5de1aee780af1ca52c02fb
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://smidgel.ru/uplcv?utm_term=gluten+and+dairy+intolerance
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde619e1df1---14547046512.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cd9231f5a---funixifanabiwimaxig.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4afd0900c1---vizozewomo.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3030540cc---93322871904.pdf
    • http://cafehinglung.com/uploads/files/97263653719.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ssfe5hqorufau4grcreuaanf24/35770107738.pdf
    • https://digireg.se/upload/dixebizofavijexidamow.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf2fe35b3---weferebuvekovojonolugogon.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a522e028f57---93109942385.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8ad5273cc5f804ee7cf3272999e90ca5/84596967725.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/tkq34q09tjsqrmqqpc3ih9b39l/kabiwenugokeparokogemuwid.pdf
    • https://clubslotalmatriche.com/calcas/file/94386577892.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084b4691b987---1528236027.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/94436052283.pdf
    • http://liberty67.com/clients/41815/File/turirebamodakanotosu.pdf
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/waxeteleko.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/eb85db1d460030f3c2b8219dfd5e5281/8851217547.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/786e5f4b7a4f5a44e3e4802b5b514a8f/xezugogevigonij.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7222dfe56d29c91fe45c1a7b4b97cb95/28297193112.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/td55mdvei2unuoenbq4dlr1q9a/xiluxenojejusavojegebepis.pdf
    • http://sushiloverca.com/uploads/files/49693732411.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b400933a7---tadipot.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f49ad241c856de5418416b6d6fbd910/jikipulule.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67a62617bd---60386455253.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/35c998a7a953d5e5eefa070425ff7c3b/46238553541.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/542587195.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_off0000ea47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 16792 bytes
font_01_sfnt_off00010259.bin
5ec3355d7cbf7db9c47a0972b46d7c28813e169d5e231bba797880f609284e3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 16864 bytes
font_02_sfnt_off00012deb.bin
0144c8eb82baff9c0beaf247839e83443dfc424c377635df294b4d629c378d47
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEB 10448 bytes