Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04ddf9aa5accd41…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 16:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a81f7d1883a3ca3604ac94cd452ca415 SHA-1: dbde73b1dcdcaca9be5260e1f075d7ac9d91999d SHA-256: d04ddf9aa5accd412db6d8ea0334d6fc244b342ffe34cd772d8ca58799cb2612
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=animexstream+app+download PDF link annotation
    • https://ekinyalitim.com/depo/sayfaresim/file/50150863419.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/33341893925.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/vapifasijalot.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/mavofug.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/zominezasewopaluka.pdfIn PDF document text
    • https://trainova.com/userfiles/file/15520441841.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/oth0emd544nt1f7saj7atiuhvu/60634316855.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/36839631039.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144da25dd913---21705137459.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/liniketajukituzax.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/87314338074.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/xuwunikepewirafe.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/53905174096.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210917_2CE60B67E66101A8.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///16476968712.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/62951615802.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f913590ea---79101315621.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/miterebexafimofuzojosekun.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a599e2e1a---38875157051.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/kawajuk.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/xutazibudofolopuvowar.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/vukixan.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/gitirefojipubunadapesawif.pdfIn PDF document text
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/48060905841.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_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 10720 bytes
SHA-256: 1309eaf4633e328de3a0ee747f882267c78eaf731f469d060a482b9ca8da9ae5
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 18084 bytes
SHA-256: f06144b378484121b66d9ea11355cfc62eb78d8a248b3655d3e4c6bc99acc671
font_02_sfnt_off000125bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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