Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce242bff70c0579f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 21:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7424d3919d8b14dd47803b20f357b910 SHA-1: 708b2b5a0308106d96bc02b3c946ce9708dbc0c3 SHA-256: ce242bff70c0579f48990db1d87178ce4c41784691ac9f4830f34ba88f78f924
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of 'utm_term=free+online+video+downloder' in one URL indicates a lure for potentially unwanted software or phishing. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://queure.ru/uplcv?utm_term=free+online+video+downloder PDF link annotation
    • http://jiachuankeji.com/upload_fck/file/2021-9-22/20210922182421478731.pdfIn PDF document text
    • http://okvin.org/userfiles/file/xasokufi.pdfIn PDF document text
    • http://slsnn.ru/content/files/95385153809.pdfIn PDF document text
    • https://www.colegiumaniucarei.ro/ckfinder/userfiles/files/zetotuvu.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/zetawe.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/fufujaresaporikamexaxid.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/6np0psiunq68t2vr06d8cn4g3g/42235492420.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/17880076334.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/nudivixeve.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/5924010581.pdfIn PDF document text
    • http://erpos.sk/data/files/memebutojujusarof.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/22950097137.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9208cf2a9---nolimawasazoritaxigo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3455f302---fugogur.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/23733732419.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/90642578551.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/rebuz.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/nelogajemejuxizizafutul.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/941405767.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db4b0c4c19619e5580fc6a0e5911ffe2/61333276608.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/sabobotubavemolaken.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/vosovafatupokezawoxi.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/galiwemezoruvixetubol.pdfIn PDF document text
    • http://congtrinhxanh.vn/media/images/upload/files/xemowazame.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/68525804810.pdfIn PDF document text
    • https://o-dance.com/upload/files/28975233179.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/rulibes.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_off0000e0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BA 18000 bytes
SHA-256: 85280aa73ad44bdfbc33cfb2249477eb6ae6a69cd6c4ec6a95071583ce01a8e0
font_01_sfnt_off00010e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001265c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265C 9944 bytes
SHA-256: 2345baadc0183192e40ae9f2f93e67d3a553e3df01ea801163f49730a19bdb2d

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