Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f873e45813fba6…

MALICIOUS

PDF

84.4 KB Created: 2021-08-11 14:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f21d6b76f0dde779b79b8e8237b1c66f SHA-1: 7e16ea3ae4fd822e925ec14942f705df7480f96a SHA-256: f5f873e45813fba6c80cf3c3e44ceb6abaf48d17a03ac7bed89a96497d4e31a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=difference+between+ratio+decidendi+and+obiter+dicta
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0449678941---gapafikutegotibizaxufedu.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3444ac50cb---dobowapomipowegexadisofap.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/88613676931.pdf
    • https://maviet.vn/upload/files/32362018112.pdf
    • https://adasms.fr/userfiles/file/zobotuxopefunafukesi.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/11736723252.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b1400ad2---zuwaxakomebetuma.pdf
    • http://clingac.com/d/files/vezixal.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/28e4614217e5e61ff0751a9889b61eeb/levinonafaxut.pdf
    • http://ettorebelfioreliutaio.it/userfiles/files/tigawokebaxazit.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9b81c637900b33db18d253e9dc1c6d41/87323969159.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/tobomorugokuzamofiji.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078273708842---xomir.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/71430644790.pdf
    • https://101doctor.com/uploads/ckfiles/files/60b825383ed06.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b7edbd1d1929b16ba819b506392cf286/571837628.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/db002f93df20f3be0d9e3e62c0c2b4f4/zupugez.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c44cbc8dce---15236748174.pdf
    • http://elskenecologie.nl/files/67048069808.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089300457f69---3313177342.pdf
    • http://wronba.com/uploads/wysiwyg/file/rawinokijafok.pdf
    • http://alfavit.tv/userfiles/file/32429803319.pdf
    • http://toitureetfacade.fr/data/Files/tunuvexizavokifefeje.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e876.bin
dee099724e17cfbbbddc7e599afed846c649e6461018088c9ee39b86eef3ee9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 10480 bytes
font_01_sfnt_off0001007f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 16792 bytes
font_02_sfnt_off00011891.bin
58839d4b0c68037b1067b2f5cbe30d4480e989cf6404aed61e9d9201dc666f08
pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 16984 bytes