Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af37c0e892eb803…

MALICIOUS

PDF

84.8 KB Created: 2021-08-21 05:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5dd085c686a12bd0d386b47c3c39467d SHA-1: 4e422bb79e4f2d8606a07a8f92923b26b7051c10 SHA-256: 5af37c0e892eb803da6ab7c3a71c7c77b53a1538d5d3c5e65db3a29d11d5245b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://uptownchantilly.com/uploads/files/93112049526.pdf In PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/45822634703.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/lolaxonisi.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5ohgh3e687v7k6ta55utvkhot5/megeboxireximegugakuvoken.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/24275345212.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b6150b2f7713fdd1fb985b80bd31f271/69039273720.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/hr1i34v3p2odnmp9c85ainhr94/larifapajijunuwaxuvewexuj.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/92515655712.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d606b7dc---zawof.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160770f1a94ba6---movanexazelefiwoxemufafi.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b0128b0b6---7380567942.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f809f23f0108b13d82c7f52c77ce5e73/gubuzuma.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ioa3of4s2qjlk8rrhk8h54jn12/tusozepelorukofavubogi.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/wupozuw.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a7da32dfe5b86d341d3c7b3b0377182/nipato.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/tuwevumarokomekijas.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/sotumulilituloxegapa.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/40768868997.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/35096292358.pdfIn PDF document text
    • http://tipiland.net/upload/file/lezolododized.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/11656308796.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/47008370781.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/jakonafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=human+genetics+concepts+and+applicationsPDF 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_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 16484 bytes
SHA-256: e907641f36614672ba9f84ad6a8222c913474d654b19265e3e03311f02989fb5
font_02_sfnt_off00012b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7D 10848 bytes
SHA-256: 1392079e5ebf161a6fe29891a655ce880c06084ec23cf92efd218093eec8b8d2

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