Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec050ddbc401ca45…

MALICIOUS

PDF

71.1 KB Created: 2021-10-02 16:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c2722e287fc7b08832bd9d16e0f630a2 SHA-1: 6c0c73227cb29e5a0a76c17eea22ecf6f729c9c7 SHA-256: ec050ddbc401ca45da0f8bf36dd046ae5d27b57fadaf74228e5907ea718be2f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point 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 for phishing or distributing further malware. No scripts were extracted, but the presence of multiple suspicious URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=pca+interview+questions+and+answers PDF link annotation
    • http://findusafranchise.com/files/files/bixesizajavekepibek.pdfIn PDF document text
    • https://birudongker.com/contents/files/wemafuni.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0ea0d3e6f---varupekanajok.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55e302112---xoludosalopipop.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/11178106577.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/radodeduxitagisatikos.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/31091717192.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/nojolikaba.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/20313838216.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/24236948899.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131d717a9bc9---60450239949.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/160545711.pdfIn PDF document text
    • https://ilo.tasksplan.com/userfiles/files/74641371936.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20211001045950.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/pemoxeju.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/94305729087.pdfIn PDF document text
    • https://majubesar.net/contents/files/kofiduxujagusupinosazin.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/61625480803.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/fb272f481270ca44b6477f602a1bb02c/furojumovuvezipixig.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/gamapofiketukolal.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_off0000b0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B7 10716 bytes
SHA-256: 17c4ab81b4804b4ff99a707067c6bfca229321713a9ab866c2fe5e02da9eb222
font_01_sfnt_off0000c952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 18324 bytes
SHA-256: 83057de0aad64a4b48c3eaa383a1130bf21dbd3d002c85abef111d97f041be87
font_02_sfnt_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1