Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c096f6ae8ca817…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 10:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 11e166586297d84e8edab503fc326284 SHA-1: 5dc28efe68d40125e90653b01a0e53d1482a61b2 SHA-256: 12c096f6ae8ca817d5a055d660d8b710dd487a3d8c0974e722cc7284326d2d2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, hosting numerous URLs that point to potentially compromised WordPress upload directories or other disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://clinicscrm.com/img/files/tefipal.pdf In PDF document text
    • http://achilleferolla.it/userfiles/files/59706162112.pdfIn PDF document text
    • https://33mobility.net/uploads/files/9514682288.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3ddda8b2d---gefujixijagagexep.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/64243203950.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/68295942230.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/zaroj.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/70a68fd55fc4681188368ea219c607ac/36952141154.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/filoxijowoxibaredumimaxo.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/77972943919.pdfIn PDF document text
    • http://llux.vn/uploads/files/42654374905.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/26057920930.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e8bc3419b---laxudupunugasagovomuk.pdfIn PDF document text
    • https://people11people.gr/uploads/File/64279708511.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0ebdbdb33---78426932572.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/jixigolipirebi.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160915bbd89bc9---66363227792.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d1d7b30488344611ee7f79f8def4226e/36966461493.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/06463e03620e6b77c66df19ccd984870/bonejijigoliz.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/75658765487.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/bodoxogejofituw.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/94469435750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=factfulness+review+pdfPDF link annotation
    • 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_off0000cdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D0 10724 bytes
SHA-256: 5a7351e1bbe43e76fc6f2c59bd3029890049239b12c1c828dd51313ed2984b3f
font_02_sfnt_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 19148 bytes
SHA-256: 161cb407771cf92cb4c61e063d9a056c531003c06e6534b5ebd083b022e3c2c0

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