Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab65f336f7bc29ec…

MALICIOUS

PDF

69.8 KB Created: 2021-09-05 01:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8c22ec91f25979e2a34f91ee81511be SHA-1: 3fa56b38d0974c192412582c94f850bfd2209b38 SHA-256: ab65f336f7bc29ecce6766570052ff7f5448e3ac07a3a470bd5db4e15149cf78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to exploit users via malicious URLs, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gkscam.com/userfiles/file/mojos.pdf
    • http://ipceurope.com/assets/file/fomutezipajetogukotij.pdf
    • http://suacona.com/clients/16856/File/zuxizuzo.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/onb2qdj9gmr13vpcvl1m595469/fajuvagakiwozaguzabivogob.pdf
    • http://andlupa.com/userfiles/file/55186876306.pdf
    • https://alarouba.com/ckfinder/userfiles/files/fomimoxa.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160845f5ede207---52236840239.pdf
    • https://oxi-dental.ro/imagini_ws/32199945761.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/233f0b0ad8d8564c69b70bdaec789634/51216975417.pdf
    • https://apizf.org/public/file/10961772982.pdf
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/34229660965.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a89203f1ed6d65e09aa7ae985e86ca53/77479633677.pdf
    • https://reniuved.it/file/xikipad.pdf
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/filexirefalezo.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/padutororatulilumud.pdf
    • https://atpl.aero/ckfinder/userfiles/files/rilop.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/7344d4a1ac2e28a44d74accbd1784c57/20433427740.pdf
    • https://jagamimpi.info/contents//files/defakid.pdf
    • http://mega-treid.com/userfiles/files/11838088001.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c1f795ce62a2f39d2b35c2dcc6c29653/51298721085.pdf
    • https://stbenedikt.ch/userfiles/files/latuti.pdf
    • https://whitesal.com/data/images/file/4423_20210804101440.pdf
    • http://maszyny.pl/userfiles/file/wavovino.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=klasifikasi+kandidiasis+oral+pdf
    • 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_off0000b427.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB427 16792 bytes
font_01_sfnt_off0000cc3e.bin
e3c7b5286f180c7a594d649942d01d9bb5eade285e1cd0a701283c00a21c700e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3E 10344 bytes
font_02_sfnt_off0000e394.bin
acb8ac22fcf5d85fc1dd4e85daa7252202c01417dba41f0c3353b9420e2ab593
pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 15140 bytes