Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ccb90362bae0fb…

MALICIOUS

PDF

90.7 KB Created: 2021-08-06 19:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b59fa7add17fd3da7eda3eaece0e1663 SHA-1: 21460d679703242552d2e7ffaa2fb8da7e66dee8 SHA-256: 64ccb90362bae0fb136f84d838f26b7419905d48d5098708593c09159aed27b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 https://cructi.ru/uplcv?utm_term=vontade+de+urinar+toda+hora+e+ard%C3%AAncia PDF link annotation
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/bsnpsog7s44lusiia24ch582fc/zodusulevoluluwugobekogix.pdfIn PDF document text
    • http://houselandia.ru/files/nuvevilixotubulitefer.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74e1c8285---56282187001.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062112041527.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4664cccfda---punokeliwowij.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077acde9eab8---27075004156.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/sogabovigadove.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/loripideredazenubita.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210624_433BC94E20849AC1.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab19c19229f---27953332147.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a869bdb5dd9f8906f2392b7995e95aa1/perinotunolinagunow.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/9642953784.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/momijonevatosude.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/dafidumijuwemipunisuzod.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/65ac30d5d42c8e5ee1764101c5519354/lemibinomemavofon.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ccd1e7e6---xerakapajuwexapeluxidexu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fbaae2d0f413373c65e47480f0bcb2e0/57229831450.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/magusoputenonoxumofuzavuw.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210706185804.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/tomamedopigajemad.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/6208706062.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/ledidejoro.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ed73c1ea500c531311f44f1737ac8a29/pogujasobosusokagafataka.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/29783066813.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/sv2d74t33j773jhqqukf8k3bpj/wapegenenixutejoja.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/30585e4a1066f2a12100563390dd4ff3/kabusozu.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_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 10480 bytes
SHA-256: e599256546d285646f76bd67bff9ce26317b9d7ec6cf0e49f692006d24b19ac6
font_01_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEB 18636 bytes
SHA-256: ca73af74051b3e14627475a2379784729a04606b1d8dc43056f0bc8b95b1ed1f

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