Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b615ac5c13d55e6…

MALICIOUS

PDF

87.8 KB Created: 2021-09-05 23:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b5f1d5655d73b760c8253e3069573d56 SHA-1: 793443cfb3cfee279a6cbce24771db23b7e6dc10 SHA-256: 7b615ac5c13d55e64d2cfda2ff33c2958fa48efff2e0038c98b60154e1e36bfe
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or downloads. The presence of multiple links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/7c8a090edac1a2b62db37bf80ec87f2f/94378352548.pdf In PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/nuzoberuger.pdfIn PDF document text
    • https://alohasafaris.com/files/63270207220.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/bfboujjsa3ibhfrb7t2im0ac22ejsdk1/zalik.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ed7e8a70c55eecf1edf0050a7b3a43a9/90059365198.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160825ad22ca04---bevasasirawituzikefaju.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210514001202.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/fajulatelagipazezumew.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/n6c3kbtqbcks5gq99iv9ppth5n/mamejalukusarevokamopi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edde9910b23---85406777251.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d977b2f539---kifakefom.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f5b7deefba28f026856f4f1638806cb4/88585686337.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/vadutesa.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/18v3umb3prk38jgt6t74sbvtjq/gabuligovumovazokugisoli.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16086b2c7434dc---bokitisunofexozoz.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d742b3f2e5a---taxevomilixemozogaka.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/30113770340.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f6603839---jasakezezefav.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/cdd71d12decce41e70550593cb698a49/vodeviso.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/29606963027.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084242334265---499087878.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/wufikesube.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/vixug.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/nelopulipuluwenixedetasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=types+of+hyponymy+pdfPDF 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_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 18428 bytes
SHA-256: d9476cca1422b56586536686ab44d1c2e865a8461ce510c9f8590f836666672e
font_01_sfnt_off000122d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D8 10340 bytes
SHA-256: daf013afef4b28662671df6d735234e6e09147fd7d691421ab9da4c308e53c09
font_02_sfnt_off000139fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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