Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac60a8a80b7a92ec…

MALICIOUS

PDF

89.8 KB Created: 2021-07-25 14:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e42843e20418b0e400bd09145a0bf83 SHA-1: 714fee112a65afadb097317f32b4c035bf3c2590 SHA-256: ac60a8a80b7a92ec095c215eab77798b53784da0e134b0ced36ac02fd04ad92a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malware or engaging in phishing activities. The presence of multiple links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m1djtk193qa3bt02env9rpbbg3/21202458502.pdf In PDF document text
    • http://akkoryazilim.com/userfiles/file/18355210579.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gddh0nrv5edhe5rt8uens6nj4j/50891562412.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76ce1b7378---69883627290.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9f3035ba---pirogovemegoxe.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/rumup.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e76168f1e72b1975738bfe4eeedf7bde/nizipuvad.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210521005809.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/b8g5ocfpl7vslaj8ee2l4vmu10/zamejaderexijesijubosivon.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deb63ddd44e---kebakipanabak.pdfIn PDF document text
    • https://tckontrola.hr/files/gevadomavubijegubedixi.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/82daab300b7062276fc9d4ded01747f7/vumalakezo.pdfIn PDF document text
    • http://rld-carbon.ru/file/ditaguvaxatubipodexebof.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/vusez.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34245a5818---vezabuxanuku.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d166090396---20774244725.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160baff5ce5d8f---sinososeluwoximizowuromi.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/33610127404.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4150ec840---84438032507.pdfIn PDF document text
    • http://vkts.se/userfiles/file/29954302445.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/vanotedinixapemakob.pdfIn PDF document text
    • https://basisnomor.com/contents//files/72080686055.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/99483855418.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/ad3dfbe7e2ad930383d69d59c1bf78d4/mukugi.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/purunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+apply+for+roadies+audition+2021PDF 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_off0000f811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 17204 bytes
SHA-256: 8c387245738f7733e7f78f83b0e15c90918d8c85836a2476fb61c75ebf0d55ae
font_01_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 11076 bytes
SHA-256: 537d2e054078a87f649086a02484aaa0be3b18e5eb24c9561d729c3aa08eb0df
font_02_sfnt_off00013f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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