Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31e5054f44d45e9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 06:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a577b8dbaa551f591c744b897f34060 SHA-1: 479d83f7005a85c45b8e32a8969b02c716b3c15b SHA-256: a31e5054f44d45e97cf72720066ed86df7e5c34e96e506ee7cec39c17f163c0c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the PDF structure strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

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=evidence+of+evolution+worksheet+answer+key PDF link annotation
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3305ad428---sipamewosafiz.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/xibejepejuz.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/gevepufojawa.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/gegigikuruvinaxeniwiti.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/56720828374.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/27372363827.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/nezokexemowapinunew.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/52504003007.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/47732257441.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb835d7b3---86489744085.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/80280669097.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/95fc8b0d79a37276d1a627a182dedf00/dapeworafaruzegobulubu.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/38672203829.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c41b25b93ed---91366417475.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/kuzatewozezituri.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/66924119662.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/94388531364.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/fojafodokefanir.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/ligusanapudilifusapin.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c75c485db3---toxuxamigejatiriwadorip.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/gvgjq83rvnc05gneqtdd1si0he/mozezogugijumerawojukeb.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdb9c15150---96562405804.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad830507893---61069177973.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/96846799852.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be37929efda---senedotos.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8b086e4e---32143408422.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c02391c25---12358208791.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_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 17588 bytes
SHA-256: 7c636c1db73c9ca2436a8a523fba31aafbfbfbb95f731454d0091199f2618072
font_02_sfnt_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 11012 bytes
SHA-256: d8559b44daaec4d3867c15b5a7c34ce9492ecf599e542976324c1f3d8df0361e

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