Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f494e0b29c514a0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 03:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8996282d6890fee3a7df74e8f446751 SHA-1: 2fba39dc4b80c71d5f52a429026e7641a88f19db SHA-256: 3f494e0b29c514a06e4dda6e1cd73ee741cf86ca08fe305ecb2240fbd0268799
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/35d8fadba0ec217b28bc517ac50fc8d2/luvawunimovitakubovu.pdf In PDF document text
    • http://agrobud.net/uploaded/file/banit.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/97532086708.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/kedojosuxejad.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/wenejad.pdfIn PDF document text
    • http://ewtch.com/upload/files/wuvoritororevarisukuwugid.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/99193716286.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f395e3ae2d---bewonoxadodal.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/44736889385.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613536f96e80e---jatogekojimuxogef.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/joritududeborubil.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/fikexafebewekefutuwetoj.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/9859968344.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/jenikojoxugivasovuduxele.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/jozireserigog.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/80754486929.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/64314838623.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/fikoxidenubus.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/4030057542.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/newamenewixativowomis.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210901212452.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/47431783440.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613838180143e---fulodopidukodidufuma.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/wamelijunaboxi.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/vobenesezukuniba.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/81471307589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+run+adb+commands+in+androidPDF 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_off0000de06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 10672 bytes
SHA-256: f46078349e963387ccada5356cbcb0a59c82290b14274bbe5367e38b246c0e22
font_01_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 18612 bytes
SHA-256: c6a9837df8f5a852042699c5d9d75702cb2b739c19f674721c9c24b8fc0a8a6c
font_02_sfnt_off0001269a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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