Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5534d921a4e6605…

MALICIOUS

PDF

75.6 KB Created: 2021-09-20 15:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb242c0e643988f769cbc797c8110cb6 SHA-1: b7bcd94687eab00c6f8748ff023586269255ac43 SHA-256: d5534d921a4e66056fb9ec122dd34c12c9366b5a6422bd997e79172335d456b3
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the document being a link farm, with many URLs hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious content.

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 https://huntic.ru/uplcv?utm_term=live+tv+channel+app+download+apk PDF link annotation
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///75703427142.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/fimome.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/fitofupamaxiz.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/1749909699.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/funadopiwawu.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/63475974916.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/gazedubapijod.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/53876880666.pdfIn PDF document text
    • http://tdbm.vn/upload/files/digupoxikasowafelomara.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/52813991323.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/87802816b33761d92391c14385b23050/4517624180.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139d114d62a5---kuxeko.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466852d2d24---47303299508.pdfIn PDF document text
    • https://bu8m3tas68s-b1.com/contents/files/farox.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f06200490---lajasudofedisexetanukipi.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/36437398541.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/27163244545.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/2l7eom20kua3sa5oibig9s4713/jabuzumabimo.pdfIn PDF document text
    • https://cape-electronics.com/media/file/15294249067.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/59110613749.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/newapuza.pdfIn PDF document text
    • 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_off0000c3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F6 17544 bytes
SHA-256: 591dc2f245c7a0b8e67c5710c4062b6c02c9fe872a5d8140e775c3310832a4c3
font_01_sfnt_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 10544 bytes
SHA-256: ac8725c8895739859f0cbbc3498b3b67760cc97c3ac38e896ac2ce15bd1b0d0a
font_02_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1