Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3eb94e6c1fdc1e5…

MALICIOUS

PDF

71.9 KB Created: 2021-06-14 07:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5ef5ccc4d53184a1b6badd0f7f8c239 SHA-1: 1556698cc10144d78debb74caacbf01cb92dace0 SHA-256: a3eb94e6c1fdc1e52270a202410d7508f8accd00c596070bbe6c984b148474d9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links to disposable hosting and compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to trick users into visiting these sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=mere+nishan+mp3+song
    • http://nappsa.org/userfiles/file/tazevowuxe.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/2ea5a4027bd37a96f6296f9001b69deb/99701544914.pdf
    • http://absolutelyneon.com/userfiles/file/vibunas.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/8mlb5gdah10rci9u8kbjh82t8b/jesevamosufurovur.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160885573e9f0e---9843721784.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/78ee7eec8193d7c2b4df726fa853d07e/93560673014.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/5kfqinrs618c6e0ih32gsord2u/51639230756.pdf
    • https://telenovella-bg.com/files/felezobegegexif.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609b2ea90c697---97945967366.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63f43ad9ff---92336290752.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/dodifenuxefato.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f8c86e0ab---21696781102.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ea3a9510998341b0460a80acf977f7c4/65122787285.pdf
    • http://crosswaysrecruitment.com/userfiles/file/zudufiso.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ba4945588f7d786dc05859c3d1c85af4/17338514017.pdf
    • https://laatjehuisweerstralen.nl/upload/file/mavuzumotozewazalodekub.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_off0000d898.bin
943cefc225215b5e99ec0baea3ff82e0eae7264ac34d52b344fb2cddeea65c78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 5372 bytes
font_01_sfnt_off0000eabf.bin
bb338b4f128be70e33f3f4090ac54fe6a0e590b2f00d9f0cdb27c157c5ebbfbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 11484 bytes

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