Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed298f673b3bb2ce…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 09:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 67fd9df8a3ea346023aecdecdea2a1a9 SHA-1: bcf66a47f3314492685241295181026fc99e2d83 SHA-256: ed298f673b3bb2ce568db648cde7b0eb69d0682011a2a2aa3cfd9ca66cfc5356
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161125bc108305---sefubavotoralifofez.pdf In PDF document text
    • http://architettodrabeni.it/userfiles/files/81534951103.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/94863371901.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/23078594381.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/503707895.pdfIn PDF document text
    • http://ktcz.eu/files/files/99516728910.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/58988074647.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/biwibuzumofaga.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f042d3ebe---bevogebijaduberixu.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/82838406580.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/693c46lin4os5p5bu8r3filfd4/54561664838.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/65e1208977d3728f9f0fbd1963e9d2c9/zoliguxitigazisutikusezi.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pekelifazagu.pdfIn PDF document text
    • http://araonline.hu/uploads/file/davoxumutupamapinom.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/kulewarukawuzufavokez.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/nupirusig.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/jalituj.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/nijisanage.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/23/kuboforidaxopiwozugemeta.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf70d691c4---takokibez.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/91613646170.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cddcf42b12---40893691500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=one+to+one+relationship+laravelPDF 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_off0000c003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC003 10440 bytes
SHA-256: 0897bb9151fd556ac91bad016357739a828e1bb053558415b7e9315878908574
font_01_sfnt_off0000d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 16708 bytes
SHA-256: e1b2c2689846c0a483bede6dd326916ee0f89d8bf493aeb7eb4663985a51c9c3
font_02_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1