Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8240d823ea591e…

MALICIOUS

PDF

90.8 KB Created: 2021-07-03 19:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72a419324a594d7f7a5807543759653b SHA-1: 08da6277651b7db819a1d5143121a74aafdf5b2e SHA-256: ac8240d823ea591e8e8a5176f8677266f0d81da309ace368003378f6cc5a73e1
156 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. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely to distribute malware or conduct phishing. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://driver-jazda.pl/upload/file/guzagevi.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/49itcd85ev7gpu706hjur5hedu/gevewusolumudalamisoneves.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3515fe12f7---40821612270.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/70b91b1b4f21e56916c86c12047d12d0/xozutavavifonatezokipen.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92da021eb2---xegip.pdf
    • http://iwishop.hu/file/dotelaxeravefegikide.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/m7nffg6se6iccvrg51l3imrd03/ruzijavolikamusiw.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/r4uqp2omm68vu34p64rkqhiafp/52450472584.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e587fc9284---mulisor.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd24d4f428---gipofe.pdf
    • https://ikansambel.com/contents//files/54708849769.pdf
    • http://botosani.ro/img/uploads/file/nafuwidamelive.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b325d778c9d---lixigokifi.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/g28v5cm1mujkuoqrelo47qqa36/42842630513.pdf
    • http://blatt-gruen.ch/files/kiterufumomomozufesosok.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/43a72b11c247742c0cc6caccbf2fe1a3/87942168542.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160712deba53ef---73833577799.pdf
    • https://5uempat.com/contents//files/muwovokexaravukem.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607321ccce308---87153897275.pdf
    • https://thuaphatlaihoanghuy.com/uploads/files/walixasedefoxaw.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6423a3744---nazizugobupajugujolowezit.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bff98c824---2248611872.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8683c04c5---debugujo.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd6e513eb---49496192085.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2181c612c1---xafupowaxesadom.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+mythic+plus+keys
    • 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_off0001020b.bin
d7e2e3145cdf4f0258a81fb2c3f7e3085210d48093de9d4061cdb6309a087516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 10840 bytes
font_01_sfnt_off00011b1f.bin
8368ebd43ae8b2fb6aee1c96f49fc8f6a0c3311a412c55433145e16182e1383d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 16528 bytes
font_02_sfnt_off000145e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145E9 16792 bytes

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