Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53fe92bde1055f5…

MALICIOUS

PDF

81.9 KB Created: 2021-07-24 10:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b377ccfb62bc0933f1e3f2061e723087 SHA-1: 1313619cfaac9e3533d67c61cc89f1eb475961cb SHA-256: a53fe92bde1055f55cbe8a9d83fed34a54716d93489023b37157830ca0430acf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and a machine learning classifier. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cdmvt.cz/sites/default/files/kidomevewojojej.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/m6eqlfr4sdnr6354hhpar8cca6/66151201808.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160948a93c35f9---teduda.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094b25ba06e9---funorow.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2ee434b2e---18503484924.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d958648d0e---48402630283.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c89170acbe0d8b183997dabf6704c6f1/40164048347.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/0pgbbgtjps61ia40iembhifr4u/subatakubizu.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a6a427ea---givinixupimib.pdf
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/sagaxola.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607d18de06dc1---96190973107.pdf
    • http://backupcenters.com/userfiles/file/14447984753.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082661a88179---fumogib.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d103c415e4---4202998406.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f6df8a127d9e9ce2ced63782d5f391aa/mafabetuguwafobov.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8iae3l94elg38p8dsfiknmglti/4523538268.pdf
    • https://syntellect.ru/Repository/file/73941886.pdf
    • http://ayurvedicclinic.org/userfiles/file/15597353431.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b4edd9275---35726548964.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0e35508c5e064ff08516dc9bb91ec063/padanodunefe.pdf
    • https://alshamiltrading.com/alshamilfiles/file/7510287506.pdf
    • https://anthonygillant.com/userfiles/file/komilulibiwajakixaz.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16079dfec860ea---7517281704.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/38095709151.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=como+instalar+corel+draw+x8+con+keygen
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B0 16792 bytes
font_01_sfnt_off0000edc7.bin
214ef6c6d4867b88ef6b633450e6aeafbe82dd37fd550b6d336e6079f8d239c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 11344 bytes
font_02_sfnt_off00010867.bin
5b5590825cfcc23ab6b878fc9885fda95d57bd6ae47b7e6ab2bb0ea2da75ef98
pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 18288 bytes