Malicious PDF — malware analysis report

Static analysis result for SHA-256 926286640ba60ae8…

MALICIOUS

PDF

79.4 KB Created: 2021-07-24 14:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60d4f6d842cb751bdc4315be6866301a SHA-1: 4eb73eedcab35db82ef4eea36be9df8fc8787a5d SHA-256: 926286640ba60ae8bbcd32613bc4422be4a2680da89d15f5bb7b975babe7a0dc
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of embedded JavaScript and a link farm pointing to compromised WordPress sites suggests an attempt to deliver a secondary payload, likely disguised as a password-protected archive. The document's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/4f9e1dfa02733bf12b202db427c8ffea/leripebudaro.pdf
    • http://cardealer-space.com/js/upload/files/nefel.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/63j491s8qhoskqaq08pri0s4p3/nepagixujawek.pdf
    • http://goodtraefarm.com/ckupload/files/danapom.pdf
    • http://tradeweb.es/userfiles/file/69429627785.pdf
    • http://leebyunghun.kr/new/upload/board/files/gidajedebifigeju.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/7c880f6b68c2c4d328ce193b0744c398/26784503323.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/2morh2rj84u4qo1mmsln313f7o/79188560784.pdf
    • https://rinducm1.com/contents//files/zaxefenomemu.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/sgoi08p636qr7rpmn33139lfa8/mumifosamelavixafude.pdf
    • http://ovodatar.hu/userfiles/file/17939865176.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813a41c1065---wevogafo.pdf
    • http://beijinghuojia.cn/userfiles/file/dugesafedipapedalolur.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090caae4239c---norobowifaxebuguro.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d6f1a1e4d---bugolerilanuwuxagixenijo.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/u69hk46kfegjksihmi05qgj5n1/jonofesiropamoxakum.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d38233c5a---41098221083.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/1999fc0cb666c806b3488bd902325d8d/36043582339.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8cf82caec72baf5ad23b6754c82bdaa6/51722830.pdf
    • http://vzwsportenmuziek.com/content_docs/gulirilidabagiwil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tabla+periodica+radio+atomico+energia+ionizacion
    • 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_off0000d409.bin
bd70049d514d00ab6f0263e192adcd0b29bc9f8328c26063d3c14d7e2a398f2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 10852 bytes
font_01_sfnt_off0000eca0.bin
847482206553515dbe44502342fefd11a482258bd8cec3795635db74a5a46aa3
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 16572 bytes
font_02_sfnt_off000115af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 16792 bytes