Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf11d7d9086e9210…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 09:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3348610925c90154d94d9150db659348 SHA-1: 8a8be98661f374af393fbcfc6ba2dc622270dfb4 SHA-256: bf11d7d9086e9210bc85039161e8c0f01d6d7c434e229c960373685af73cf3b5
176 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish for information. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://boucherienabli.com/uploads/FCK_files/file/31690558314.pdf In PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/kusoxe.pdfIn PDF document text
    • https://akemi.ro/hirek/file/susudewupazat.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/71549530785.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/wirolo.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/99531334023.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/sesivox.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/funexotubo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vlvej7faucphovj85ut4n2qpu1/84765484266.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c546b9471e---76898707467.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/39538039616.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b4c98f977dfcae2c8eace3a251ce13b0/57499878100.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/8357401601.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/zipatiniwaximeno.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/87866472578.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/simujidejitemifavo.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/66968344878.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/21335261605.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16136e8874f954---84517660028.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/44270944682.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/53189449939.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/43282314938.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/63359088775.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/jejowesitogadaxote.pdfIn PDF document text
    • http://ttc-investco.com/img/files/rinefuvepasunuwizulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=unity+2d+game+developmentPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 10772 bytes
SHA-256: 4634546ebb14725519142d4cb635d5926e31ba664c6cdaa75c4eaddad75390b9
font_02_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 18404 bytes
SHA-256: 77929404cc883c3107db5a09a6bc9a41645e775a6cfd630e79d5cd07842f8269

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