Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5133d291d0bd07…

MALICIOUS

PDF

86.7 KB Created: 2021-07-30 12:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aefb3e0e07bed1aa940dfdef5a1fc8f3 SHA-1: 08ee937d031bc12509bb58f20d2dbe757f4d2329 SHA-256: 1c5133d291d0bd07500bf8cdf66d1f40b9b0645b4d46b2378684958d8f6f21ef
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting 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 0.9993

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://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/68761545505.pdf In PDF document text
    • http://heydarbaba.org/resimler/files/memaxasi.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/37968367618.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/gazujevafumiwapumupinupe.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/58824758693.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/fijovixuxaxitidezu.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/47629271033.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/30101060816.pdfIn PDF document text
    • https://superchills.com/userfiles/file/80628144199.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/nefosorigozadujerinokumas.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/51923437078.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/gisiwireduvon.pdfIn PDF document text
    • http://toyotarenta.net/FileData/ckfinder/files/20210706_7B825EE18662788F.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/zomugediwelesojofirebum.pdfIn PDF document text
    • https://luminex.pl/upload/file/zaxifesaxoku.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6d9af1bbce1b773d8d7023f2f85e988d/12843742909.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c62355c22d---gijal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb9ed406cb---duwabatogikuwabom.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7bemns7tu8mrnludsvtfvvi5in/59668165500.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/zefadob.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/t3mtc1065jmnki0059ptpv7pvk/78596572654.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/ba6feca21ee7bc8536e649ed57576f06/nelokuzusetutuvogija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=present+tense+verbs+spanish+worksheet+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 18732 bytes
SHA-256: 3bcb57838a96206c1411147c3347f4a9a01ca36ea418d08df10317f58f6740e1
font_01_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001334d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334D 10932 bytes
SHA-256: 2aff666987c632b49542a9c38e5f44ab4c36175557763d9770d577c04c9cd248

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