Malicious PDF — malware analysis report

Static analysis result for SHA-256 266ebdda36fc7a42…

MALICIOUS

PDF

86.4 KB Created: 2021-07-17 20:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94ec0e1f9f3e4148791c4c737c073143 SHA-1: ce0cb390e8aabd4d6fd76d5ba426c03af01a774d SHA-256: 266ebdda36fc7a4269dd5a841a63a73cc8c7114aac8fd9bc0acab4126c183423
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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 http://cathayred-csr.com/img-cathay/files/34184927494.pdf In PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/fibuzimifiripelidibuli.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a46ae5332e3---bejudafakezorigaku.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/18349750382.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210713_8307F0F88DD24766.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b68c3704e---jikerupowaxowe.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/c8780b46bc4ef2c8bd87fd0a2520d5bb/muruzowuninejojuzujuv.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/pinuvikanix.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc96b56e00b---80554549760.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df675faa103---dejusata.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecf726fffb---14247757516.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/df53f5fe8e4a0a704b4d82d71c841135/xivowoganajawukade.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/93ca9ed21506176bf07be17ad0d6e647/telasidakoriga.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/rixabejozevefoxilufujikak.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/70f483dbb3f6c5e1adb98d85871c2d3f/60406364860.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/58956957630.pdfIn PDF document text
    • http://atiksigorta.com/files/18943598098.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/79320648465.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/mtq21g4i899h5ukuo34i9mrdu7/79677471632.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0b372afda6f37bd4236c5ca57143eeab/tadukomuduzase.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609603dd199d6---jebifobuxulelezejeluvo.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/bd00b5c1509b74bd80725cba80ba8184/96708507653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=successful+leo+and+pisces+relationshipsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ced455211---birojivukolog.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 16304 bytes
SHA-256: 4489f23c7440380feab0b3417c6fb6da044600567a3ca4bd0226fd73427d1e4d
font_02_sfnt_off00013311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13311 10892 bytes
SHA-256: b0fec2d3e2086b01284b7eeac8e038f870b2264de23263e861d1b208dea93910

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