Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b671d483762ebe…

MALICIOUS

PDF

83.6 KB Created: 2021-08-21 03:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 795c582ea5d77427a6139f019a3ec720 SHA-1: 4bd2f102f75405a5123e09d82cdd152fd31ab7de SHA-256: 01b671d483762ebe5601eed520763715797b28dd6856fc027d493d42ee187af9
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to distribute further malware. The presence of invoice or payment language further supports a phishing or scamming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://predit.ru/admin/ckfinder/userfiles/files/fakiwozetevabenafenuzol.pdf In PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092b36a7a339---88309356379.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/89415476223.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160984ba3a8f71---vudaxekofafib.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/lazeworitojex.pdfIn PDF document text
    • https://tecnicamistasnc.it/file/60421612882.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/66fc8575af3597e84ef58e0d58ee53e3/tosiredena.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/zogerudojakadoluluwipak.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aea8b090c---kaboxubugatove.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a159de6d4---32441555858.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/c38bqbe3ru7794g1vsq94smio0/88505675082.pdfIn PDF document text
    • http://jonme.net/ckupload/files/41844279326.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607d234707593---besorijisedagazip.pdfIn PDF document text
    • https://area5srl.it/file/85393118051.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/savazeda.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e836272c606---pinexaponoj.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/tajuwawebutuno.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/4263f86fbccb1863a89e2ca8e8bd16ff/52814568081.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/11022234130.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/72063829473.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/zepofotuwopikolid.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/mokises.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8f07ab6f150904e766ffcaf9b21da30e/jiwalovaguwezuwukeluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=price+list+of+bakery+equipmentPDF 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_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 16876 bytes
SHA-256: 851b5127b3db44905179e7501c9778ba1e622cfcc8545fd1a76eff2195b79b60
font_01_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 11232 bytes
SHA-256: ee7c9fad6ab7ad49210448ad9743db020d2ea13ac6b2b007b0739173558bec04
font_02_sfnt_off0001284e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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