Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6519a76cffe628…

MALICIOUS

PDF

94.0 KB Created: 2021-07-02 06:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22c4fd244bcf07176b8b215fe7ed653b SHA-1: 02b5e8bfcdc6936864e6c7b711c6c7f9316d5e95 SHA-256: 3b6519a76cffe628ee6133a07368fb0c987b2951eab1ea24fb5ca329ab9a9b0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs are embedded, some pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2419dacd43---30044308891.pdf In PDF document text
    • https://gites-les-bardots.com/userfiles/file/48356385085.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/bokirelivitixej.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/97063157096.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9903e71971---2083889595.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160777b7c1f554---20837777181.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/tvge9rfvf9bh6fn2urkq90e4p3/21470463683.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/59693046603.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a85352770---4331541920.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/46103bdf633754deca015071fc9ee955/19790068243.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/h1qn6vsqvub1ggcg7cn5pt1a17/51968493143.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/84487930594.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/496fff55a01e29a06875207126c27d0e/nepudupisijuxofimoger.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078107727621---47312287691.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/jutunufidiwovemumabi.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/xuxugakaxamalubojikogu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/kebigegufaxewoseme.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/mesaxudaxivo.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3ts8hj91rg7d00c4e7tmptoq3n/28651440451.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a5fbd766a---11772380895.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4281eb653e---73789422445.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/kadaxanotefebagotaxebex.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/36608261048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=automatic+divorce+after+2+years+in+indiaPDF 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_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 17064 bytes
SHA-256: 5504841f24a587323a8e18f2e3e0bb7c95858b53cf66e481a542b3cc724244fe
font_01_sfnt_off0001373d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373D 10972 bytes
SHA-256: a5f2b357bec74a541fed03283d5b2cd762e0b2a2b79527820d300f9588b8c005
font_02_sfnt_off000150db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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