Malicious PDF — malware analysis report

Static analysis result for SHA-256 232692645f4be9f7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 10:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16de8a00c48ba009bead8e85fe7403d0 SHA-1: 250614a1d17abe92695e0f76154d5a35898896fe SHA-256: 232692645f4be9f7f360c27e295f73fc2f68a4fab42fcbf89fc2af0979703252
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. The presence of embedded JavaScript further suggests malicious intent, likely to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://chcial.ru/uplcv?utm_term=gta+v+android+ppsspp PDF link annotation
    • https://restaurant-kamkok.fr/img/Data/file/831695121.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/pisaxufowopamujige.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/40854119037.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/lalus.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee77b31f6f---82836535750.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/54770506004.pdfIn PDF document text
    • http://secoinblock.com/upload/files/zakufukixufa.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613126c1970e2---95347050217.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb62a0ef05---37581352846.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/ec66302cd8428d793884424123120f12/kewapofewimo.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/7070276663.pdfIn PDF document text
    • http://fpole.ru/sadm_files/16005892238.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/gezuzamevexak.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/42520760372.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/89332232916.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/wezadivotopokubo.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/49607747992.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_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 10312 bytes
SHA-256: c64904a160debfe8b3ead80708280237f6c8ed2dfa41ffd2635697ac47367ebd
font_01_sfnt_off0000f671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 17908 bytes
SHA-256: 15ddba4da2601cbdffb0cc4f0f9ccd8e3ee0c5d41a10b5f53fa164684d75c9f8

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