Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b42eb1d188b349…

MALICIOUS

PDF

89.6 KB Created: 2021-07-04 13:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5028efc69bf37f6a5eeb545e74e7aeb6 SHA-1: 8903738939720a1bb183ca6f77c2dd2098cd2a4f SHA-256: 73b42eb1d188b349ae999e6527fd6090c8bf06686ffbe1c9abb38904e477f014
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to potentially compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://aire-limpio.com/img/editor/file/palidimelezimojelitanew.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072678d2acf6---besujobibakamasura.pdf
    • https://twr1115.net/files/fckeditor/file/wiguludaseduzujofaga.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/075992f610f94cf46f873cb0bd2d1917/71922457367.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/0kmmov76odfbv9hcogmgf4avd2/zidarufofamalitutoxatidox.pdf
    • http://gialtour.it/themes/userfiles//files/59203262548.pdf
    • https://mabuksusu.com/contents//files/26848141539.pdf
    • http://kartywspomnien.pl/uploads/assets/file/puxobujegujevanalidibaki.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c9091b89c0f4b5824c215c1e1efa7b89/80763535011.pdf
    • https://bouveau-consulting.com/userfiles/file/siduwanewezidokesowa.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/aa0c0a8d68a7819cb4a0e3be05e3bbba/56333389762.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/s6n8d43qnurhr3372o4r24e5f8/94031161223.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/877b04e18ade6ba3107a9a545806d903/1304236781.pdf
    • https://foundryindia.org/userfiles/file/97688745732.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082b896422fa---74142294763.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ns302ffs4tks19a39rvtme2tf2/nozova.pdf
    • http://sinproval.it/userfiles/files/77561512081.pdf
    • http://bajajsports.com/userfiles/file/beveladukajadulim.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/gibubapivebox.pdf
    • http://jp-cable.com/d/files/98997635680.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca44b954d6---lodukikidumomidujenerej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=2000+watts+cost+per+hour
    • 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_off0000fa1d.bin
9ab6fccb47dbca298943f549dfc0f9ad4ae6e72f0ea9613cfaa0ee7b2bfe65f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 17888 bytes
font_01_sfnt_off0001290f.bin
c12ac7bf2a8d070552484cb8d98745b0bbf0f4908be2b0b6599fc51bcaee6fe2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 10560 bytes
font_02_sfnt_off00014174.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14174 16792 bytes