Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef6f62265e07e43…

MALICIOUS

PDF

92.3 KB Created: 2021-08-10 08:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 3cc01a56257a5f3e0c52194e65573945 SHA-1: 06bca7a9718f492587591e9665374e0388754389 SHA-256: 0ef6f62265e07e43758ce646a142b9d9a257b85a70b1e2d653da6b9a27e6a762
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Tampering

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers flagged it with high confidence. It contains embedded JavaScript and numerous links to external PDFs hosted on compromised websites, suggesting it's part of a phishing or malware distribution scheme. The document also contains instructions to disable security software and mentions a password-protected archive, indicating a multi-stage attack designed to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/14c88cc1eb50615d8092097e2bae35ff/97253247155.pdf In PDF document text
    • http://cn-junsheng.com/upload/file///20217212348606.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/nazatefikefonisijabitusef.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a26ebe878---93723776329.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/85264496365.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/5244967464.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/mejugeluvimofozagemabedo.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/11150802497.pdfIn PDF document text
    • https://atl-50.com/files/file/18479294902.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5192c646f88f7371ad575b1b8a367bbc/2520027785.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/misaxun.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sixewepuwoso.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4bbdaae6e072eaac72cfffa4a9825c2/35608312427.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/nikulorunisixel.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/d6d795c3cb1617bbfd3cb824c631681d/fekexevura.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854b092a944---73571203772.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/32254c542b9b37baba7dce5c67967b36/tanademugatubodakad.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/bhc4dmsdun3u0vi13jg8hao982/tazutetuzojuloluvigedil.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/biridipodanewin.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/gijovupiwoxotewe.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/12ed187b0ce2589465ad86505b20883b/kabuxuzi.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/fezufeke.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/6126040141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+free+krunker+coins+2021PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 10864 bytes
SHA-256: cb11707d2c77fb4aeceb94f8cdb558a86602b0bcfcf0a62fd9d6a20ddacf050c
font_01_sfnt_off00010929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 16808 bytes
SHA-256: 1753be37f40382763e25de57d91608d8e8e6bb67116421191662c68a4aa94745
font_02_sfnt_off000134cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDC 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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