Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22cdb2f853d145e…

MALICIOUS

PDF

98.7 KB Created: 2021-08-31 03:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6aed0adb3b35e0c19b46c35710ac478 SHA-1: be7e3553c6a035aaf973a92b6ab5035bef21101f SHA-256: a22cdb2f853d145ef1d0d6c0940ea635fe09d29d4d90f1b606c0db8612eaf5e3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://unnatiwelfareorganization.com/ckfinder/userfiles/files/72688115986.pdf In PDF document text
    • http://efuegypt.org/userfiles/file/lopedowapuje.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16126071943a60---64667347666.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/58562487882.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/tovoranemosivuka.pdfIn PDF document text
    • http://plinoxotar.it/files_pagine/file/pazofokuwopilanodisit.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf59445215a---80560503395.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a417e346fe---gipemumogifijoxabobemorif.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/09ae0353bb8f9085575eccf30d002185/fedejar.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4354a7f092f47b251d2f4432ebb2580f/68339790407.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/73546746790.pdfIn PDF document text
    • https://protrialse.eu/files/files/20582968580.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1ccd8b3fbc30015c3bc593494532507c/772836910.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/4596153a67d516df4637ef542fa8ed60/45501235922.pdfIn PDF document text
    • https://digireg.cz/upload/jafabepazorelewoxijifenev.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/80756447781.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210613234643349.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/29013526315.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/xebapajugafumogemivavi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab7961dad---53713431775.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/k057levouve0paqm8epuevlse3/36926782014.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/bisurunazefubekuwunibane.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/4279530386.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/nutolefumewudejobajukena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=encrypted+packet+switchingPDF 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_off000119e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E1 18768 bytes
SHA-256: 2056fd9d578af410190898d60cc164b0876ab39508d1b30b4228a99cbe95fd80
font_01_sfnt_off00014abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000162d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D5 10904 bytes
SHA-256: 04fd6542f30cfa3e62441dc5c4b0416122cc591a794d112ae5ee78d00c926f75

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