Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62689e8ec2ad256…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 02:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 10b90b7d81a70b30321ff846d354c01c SHA-1: 234dfae2eabb3a311ce94f37ef12092fe3b60664 SHA-256: f62689e8ec2ad2566fcc77e1a7ade388597a87b20073c3a236aa30d6c1f1e5b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/9q43qe2gvukhavs8f25ss15qu0/8830257383.pdf In PDF document text
    • http://bryanhigh78.com/clients/72554/File/12292390119.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea08e72def4522bd45633281f5a79446/bamatiporopozasamilesa.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062003300673499.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/66514040617.pdfIn PDF document text
    • https://argumentua.com/i/file/runanesikakeripipememe.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/mizogijudujizame.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bcc56156c---rilubutabij.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ced227cf5---jexalofa.pdfIn PDF document text
    • http://kbchina.de/upload/migedamovowonolaborini.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/sowitorabojiwujebugap.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/11781738803.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/32153317338.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/tatogagudiredarozapis.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/lunuzeforefozodaxegibiwu.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/xupezexilekisip.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/tinajunikapagezika.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/nawodofopativez.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160962c03757ff---25124787319.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/kakubifejulebu.pdfIn PDF document text
    • http://starsunited.at/upload/files/68170998631.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e512e48b543---sizexalenadapafiditalivi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee3d6bc283---35631775429.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/rukoravijupalikawura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=employee+collective+agreement+real+estatePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 10880 bytes
SHA-256: 1e254b680963e72e829b30b39d6519e41347000043bb612637c07a108373e379
font_01_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 16408 bytes
SHA-256: a22cb967290f968c70724790d76b50e14aff0d300f34bf386f355b7c7dd33989

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