Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb8cf02d8c2eb76…

MALICIOUS

PDF

98.7 KB Created: 2021-07-14 01:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d16582d24d1be0a241c5be53d0cbc5ec SHA-1: 12a030da17264702b78ed95c6b6e89b7efa7e0db SHA-256: 5fb8cf02d8c2eb76c7b7a38de366db9c69202fc6563ed691f40948ae6ab283ba
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the nature of the hosting indicate an attempt to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://edarky.net/data/file/mifasoparorizodib.pdf In PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/vulozobikelim.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/lawanu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c286670b4d1---kisezodomobumewiwoni.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/8412177879.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/79187390070.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160980d4f1cdce---koweridirida.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/ffd62c47d9cfc650afd31cd1388993ba/vepezomogoxorufa.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfac0cc1ed---vixejonatujeginogusewav.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a01204991db---35004071706.pdfIn PDF document text
    • https://ksuskalology.com/images/file/pomexegu.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/fujewurek.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/cnr4stmm4v8rguivh8grast8hp/lotugalife.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/kotigejisuwugavesafa.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160770e6dc1ea0---bupulutolitakebepivu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a56e9c7fefc---vuwoxiwuwubazeviwepatobob.pdfIn PDF document text
    • http://labotinnghia.com/img/files/tododivevolukuveketer.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607287c575f9b---puwanej.pdfIn PDF document text
    • http://calebdobe.com/clients/875189/File/34774197400.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/zodozotow.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6bl39evk92p8033dp356kqte9s/93121576496.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/posigi.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/21191444756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+pirate+bay+photoshop+cs6PDF 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_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 10708 bytes
SHA-256: 0f677a69d7e1e64b7b2263dc5d183d8ac896233b780cc99637e50327b7f7ab7b
font_01_sfnt_off000135ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E00 18020 bytes
SHA-256: 7b2fa4233a326a59f3cfc434c95757ff01ab5a73f64384ea90b6159289b72842

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