Malicious PDF — malware analysis report

Static analysis result for SHA-256 5025def2c5e08429…

MALICIOUS

PDF

70.0 KB Created: 2021-09-16 05:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7456ac204b29dba93e22afd5456a73e1 SHA-1: 76086a2efb7ea6864bf18e5f6eb31bfb60a120cd SHA-256: 5025def2c5e084293de0d4014e1190367d2cd1a55cc8de4093ac6687c345a1ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=bubbleupnp+audio+cast PDF link annotation
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/19859717098.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/71346372756.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/59879734842.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2f5pcbcs02od1ncp2b3mblkb65/mebusoxidisidotizufik.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/tvd2rc41rg0vfgt2g929b6qbg7/melubelovedemilalemases.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/8646379585.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/53975770164.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/80071667987.pdfIn PDF document text
    • https://85097781.com/upload/files/68056075910.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/buxividawizoxidiletegep.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210916_A1DEC92A1EEE4745.pdfIn PDF document text
    • http://trovas.com/userimages/31466137566.pdfIn PDF document text
    • http://qwerty.pl/_data/file/34760758453.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/vitexaredevazul.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/netodokofovupodozisar.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210912025022.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/pakiri.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/72029146736.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/jujepozilororasubimex.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109101316467187.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/sumibawuzobiwamov.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161404a627579a---bufuzax.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/d9269fead9b9ea1ed92d656a0390413f/ruzexudimoraxak.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_off0000b2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A3 15500 bytes
SHA-256: 8f19ec1feb40da5a67164ce69ae6f42de4fe6eb1330d09d9e57771dd2e1f09ed
font_01_sfnt_off0000da1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1D 10700 bytes
SHA-256: 56c20d676eb8a5fa07a1945a4f3253eaaf4d74cafa73235982d8350670e35a57
font_02_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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