Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a47d98fd9d9e4e3…

MALICIOUS

PDF

88.6 KB Created: 2021-09-17 23:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a8557d25fe33ee8b160bc670fd4cff0a SHA-1: d96cae4d422acc7046a01504ab524cb83df43e9e SHA-256: 7a47d98fd9d9e4e34c531d89c5d95ecb508bc0e70950ca9e96036ee3fe4429db
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://vendax.ro/files/file/dovififug.pdf In PDF document text
    • http://blesk-stroy.ru/userfiles/files/zigoporos.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/98870488679.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d942d24ac---puxadudefabok.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161403af663b04---87599544144.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/73591286666.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/kifitopuru.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c45321b3edd68bee6ab6d22619ebedc6/17968103221.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/7098184052.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/60694305855.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2a11ab5a182639aac55dafabab9b28dd/20690531093.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/lebipidukakeg.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/35973183134.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/95747742938.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff64977613---32743750152.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109170911079103.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161337133d6aa0---1667004337.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/80kp543s0s99apdod1mhdor634/rumojapifatuwafeluleki.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210903133509.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/2509636333.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/59613030278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+pdf+file+from+url+in+android+examplePDF 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_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 18080 bytes
SHA-256: 221e369bf0e31b34d1122ae6896e71a1cf8f6cd45eed519a2c9b91540eee24ff
font_02_sfnt_off00013c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C08 10680 bytes
SHA-256: 0e9977421b1b89c19ada32f65631a1aa42b626f541a548b3011c96c7658ffa24