Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e44a4e9629d5a9…

MALICIOUS

PDF

82.2 KB Created: 2021-06-24 05:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1548a46e99ecc4342ee03126c4822da5 SHA-1: 6cb4582cb0ae5b698e0eab041e3403225c1b773a SHA-256: 58e44a4e9629d5a9ef9c60596155d0a8801bdeb3bc76d3e7b6b45ecd45ca9394
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for phishing content or further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=robert+gould+shaw+letters+pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b779581dc39---towewoxomekokuporelofu.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb4a453fad---tifokikifaguga.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae70d969a---xononebibotixezufet.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc60a330f---4338302800.pdf
    • https://arvikabc.com/images/uploadedimages/file/4000815821.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6d597bab3---kirilule.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ukjc11npemta3113m9lmhn6o1/ratodativodawow.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bcfd0ffe566a9dd1342ea66e92ac9303/tukizadijaw.pdf
    • http://citywideok.com/clients/75789/File/51721799287.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7522904f32---12276346808.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a090be23d0e---97403171359.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fe2e2826---2266471732.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/841d2a68fa4a58790e84a96f75878a07/14630832368.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/sd3vjsnr9sgfl96suu8j70fo80/rizagipupawazam.pdf
    • https://flyags.com/editorResources/file/%5C/pedogagekowurokazo.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2921219ff014395eb71dc8464d97984e/60780299535.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094217fea9d5---60558828753.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/361afa8bc9aa32bfdfca927e74199885/82067651666.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_off000103ef.bin
caadd1079e04f5b60e41eadc0e5a436db2e53cbecc40a0ef8915c4a67fe7ab90
pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 5540 bytes
font_01_sfnt_off000116d8.bin
b1052a130a3e095cd571dfc4f769382d0c11f935bdf8c10cc7b6c621d8184939
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 10780 bytes