Malicious PDF — malware analysis report

Static analysis result for SHA-256 235743f928921303…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 10:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd6470797cbc5cdae05b9b7dc7fa76b1 SHA-1: af91a6300ac4a90040ef41ed6735978019d34299 SHA-256: 235743f9289213035b143bc4bd50850966613eb767ab69870d1da67eb7fe4fd5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised WordPress sites or disposable domains. These links form a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=earn+to+die+2+apk+mod PDF link annotation
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134a88ba7c35---tizibam.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307345f115c---sapigikadiwum.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/93006176093.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/firigewutorukavudorizile.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/24248103020.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/xikafusebolonaxalez.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/37419795025.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/50816724801.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133d16e474be---xabizowapapugozuwokaroson.pdfIn PDF document text
    • http://metzlerranch.com/userimages/zerodawixiz.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/bimugebo.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/56252592320.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133c28b7a518---85337273026.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/xufurizofotikosajo.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/74492038798.pdfIn PDF document text
    • http://checopharma.com/upload/files/29120597342.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/japekonexilelewesixa.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/65129798833.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021917285997.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161365e77cb68a---vubopejapazovokalasiwes.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/tuwisodirof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4247a0698---7809347727.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 10532 bytes
SHA-256: c9d2d2895b831b6d086f803f6597cc08474c07425a0c6906fd7446e359173ba4
font_01_sfnt_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 18416 bytes
SHA-256: a9a6a78e0fe7a92e456be75e110cbd6ce518239fd658fc58199a8bd360ffa9be

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