Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0151423a79edfc9…

MALICIOUS

PDF

71.6 KB Created: 2021-06-13 23:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 766d1c0a0e3294e887f1b36290144432 SHA-1: 53b5b72d40f4c436f4db7b0744b084ae701c489a SHA-256: d0151423a79edfc9082f4f1681014808d8e3798b9faac0271c1612392cc587f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The presence of a 'mod apk' lure suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=stickman+hero+mod+apk
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e6126f6a4---58623321203.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/117fba585a9d2fbabf795c9e808d450e/46897361398.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6f7a894aa9005295b0eb1af284ad651b/20442102747.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad04f97a074---zetetuku.pdf
    • https://aiaciran.org/cache/fck_files/file/37175285924.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/suekatatvkftlrgsb4tbulos27/86832424085.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c05a150234---kitiribapenowejikekak.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab50bb667d1---98370353579.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bdd084ab5---wogovapijitena.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8lcig37a265lru5n810mlobr2/79515701514.pdf
    • http://wasserburg.pl/userfiles/file/mojovofapotujededuraxagu.pdf
    • http://extracam.es/app/webroot/arxius/file/67311851921.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/cf7rvk14i62khcn9ghe684qidq/fovilopedo.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504002632709953.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc3a.bin
083cdade66650244971f4425d8d8827472ad4c10c6e7f6951df13a1ef8a55f95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3A 5272 bytes
font_01_sfnt_off0000edff.bin
46385dc8c3cdc3ffcc5888e4d20bd319c79c0ad3517973ac1a22b71ac7af4162		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 10636 bytes

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