Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e3422ce25eb640…

MALICIOUS

PDF

88.4 KB Created: 2021-08-07 17:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a46bcb514b7270fa81dfe84baa33ee8 SHA-1: 76764dd620debe30b5382a3c5d6cb77a49a37aa1 SHA-256: 83e3422ce25eb6402913655aef7b4e84538e05c38d148be123c1cf62ae38cced
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The presence of numerous external URIs, including links hosted on compromised WordPress sites and disposable domains, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=descargar+temario+operario+servicios+multiples+ayuntamientos+pdf PDF link annotation
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/3848076fea6ababc9594858d69dd07ff/15362889088.pdfIn PDF document text
    • http://neenah1976.com/clients/17995/File/11768483572.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/62813581097.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/4270e0cbf9a6a6921e7c4a8fb3e93d76/73235848719.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fbd4a9c90---23150690993.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/23203904397.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/kudokim.pdfIn PDF document text
    • http://compsult.net/userfiles/file/68950757078.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b321bb88f2d---2409546172.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/ditaxi.pdfIn PDF document text
    • https://limsurempat.com/contents//files/86568316295.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/9ece4c6cfdb14e73c6a0d712adaed54a/63742505521.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e82bf965fb040b4e5473c74366cb7ce6/14559426419.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/074d5fe3bfjmbbvmtct9naqq63/rokufodatutaliku.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/fuwevitoritoxalifuge.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///66080228039.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/54074930687.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/ee176156e0ba8daddbbd42a0eba4566e/23522603602.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/nibakiso.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c987eeea86---3069569393.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/jodalutoxunerinolajo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3a53ba363---jinegejidojufuloliwojama.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/uvo205p1ohkm2goq6m9ropln62/69399432447.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/dojopisawoleliterap.pdfIn PDF document text
    • 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_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 18620 bytes
SHA-256: a974fdf1d23f0adab3323f98d74e8e9dab9b9615bc9cff646d246e7836252599
font_02_sfnt_off000136b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B1 11244 bytes
SHA-256: 3c93459f77178a89d63b7873b373541d5f16bd861f294f743ab31f8e185bc8bf

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