Malicious PDF — malware analysis report

Static analysis result for SHA-256 752170354f762867…

MALICIOUS

PDF

74.0 KB Created: 2021-09-01 20:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9b08e42ccc5d488f0a2197c2eb79697 SHA-1: 79ef90c5c1f7c11cc2eaea801f511518ef949d6c SHA-256: 752170354f762867ec6254648b2ba7617d31226fcfef50be228126885bdaf3b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608080cea5fae---garan.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70ee623cd4---90072652399.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b4e85424bd9e796970038b209e8e7a6c/tepalujozupasigozanebavuv.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/72816037413.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/423500c8e4361d9eb375deb9b5b4f62a/pumolexupalozolovomasan.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/vokedepomed.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/zizulopamiluv.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/74jvvsutl2tsaipl0b6e7vg13e/85689094436.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/d3rufji69au9hu6pdc8fmf3auf/5032944829.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ba483fbc2---darunixumab.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/41469870989.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/29670669912.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/c7hph6gi5dftoov78cu34cc5h5/katakatej.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099b01a06047---80344344406.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/25399606687.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/69106151680.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/wopibusipu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/bf3172b4438edad0d6cf7914395b49d4/temib.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/benonefokixaxososeji.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081046faccb8---kunubusozexisedozup.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/jenowen.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/73783449227.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/85327647065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=questions+about+the+hunger+gamesPDF 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_off0000c162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC162 15648 bytes
SHA-256: 393d03b114380c26d6de23655c23cc49a606682ace0a3568c24ff67a9370e4c9
font_01_sfnt_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 10808 bytes
SHA-256: 8b36b280ea02e3e85eae5f218d12e2baab439e7bf2a886d41c07f3748bcbfe31

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