Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bdbda20b473f42c…

MALICIOUS

PDF

86.5 KB Created: 2021-07-09 17:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e55196c4f70281e10e81f68a8128a279 SHA-1: 95ecd943db63f74cc385a982247eaf4f072e0f7c SHA-256: 9bdbda20b473f42cc1c9cf3e91f7a5fe508b53add5aef2d76232139986f61528
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or malware payload. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://planet-pvc.com/upload/files/94689654669.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62469cf9e---31107770415.pdf
    • http://ekolojikweb.net/upld/userfiles/file/78762253754.pdf
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/nifozejesaga.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/7d04c0f682776a2b35632494cc1d306c/pulaf.pdf
    • http://gramercy-grand.ru/files/file/selubosowosagiretigupiwu.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/9ptevalpl0n77eq7peqn8r40ng/21240975804.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/6a4uhq2escvks1dqeb43dv4po2/zolazigudovuse.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/5obfv993vocde7lju4aunj2jba/62333529424.pdf
    • http://computerdoki.hu/user/file/gizizovid.pdf
    • http://cintabogor.com/Uploads/userfiles/files/bogipifibe.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a842e8942---luderedubifadinenonex.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c8329bcm8i07rc8g50jdaii2t/2829257305.pdf
    • https://506hlapeta.com/files/file/togebavoto.pdf
    • https://www.alapan.org/fckimages/file/kelurofinuvupegu.pdf
    • http://mai-colle.jp/userfiles/file/62781486221.pdf
    • https://joebalogh.ro/imagini_ws/20257283873.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e1069ae569c52bd73395540a1f7c6495/fukaliparogaluvokadalu.pdf
    • http://teplospectr.ru/images/files/javetuwazuvoduw.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/48829cf43ef67a59b600fc60de265589/teduwowidevetukufiz.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aede216a01---xasokezevosiwu.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160799df543f13---mepuxopalu.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/5d3d62fc7d1f5d2fc3ee170dbe7d3555/88208734579.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a9c466fc2ff4ce5e24379297f946610e/jogonuzukapus.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c457c029e67---ruregomide.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=i+have+been+studying
    • 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_off0000f0ae.bin
39bff17e2539aff5e2365908c2dce30b834c683f5223e8e882811bfafcdaed4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 10632 bytes
font_01_sfnt_off000108c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 16792 bytes
font_02_sfnt_off000120d7.bin
373fde1696641c35f23c07733a27fbb9de8d00cbfe365f543c99f743713dadbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x120D7 17296 bytes