Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a387f2bf0fd6cdf…

MALICIOUS

PDF

76.4 KB Created: 2021-08-07 11:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e4ca019733a9cca24f97cafb76cebbb SHA-1: c8dc8bd51be44e1599276fdc2d64639506c86cd6 SHA-256: 7a387f2bf0fd6cdf98b86cc572928d2ed86161b1b1961bc4c7a3a0311ee85ef0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://avision-italia.com/userfiles/files/87084576183.pdf In PDF document text
    • http://mytaylormadefamilyusa.com/clients/864113/File/kedamajaxizarer.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c80a2cab2---pinefilum.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070119431572.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/105c6325b81ea89605fcfd0e81f0dbde/24289913193.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/53265007333.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/71657504743.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adcd866ef76---14767011733.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a9b8d8e234564a8d74babd333673b01f/44067734265.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608125483e731---xumanipukasirodot.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/39607818322.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/85abbc552b8ba27e0cf740f271253617/kijewidaxijoke.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/imaau58bcnm3qag6j93vrilu75/71107579105.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/8j8hp5079q18u90bmnqiigu9aq/gafoxolivebitazikatizezig.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/64401814607.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160805aa48f1f4---78933764336.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/ifs1gpft491urve6re414httkr/sarogevopatit.pdfIn PDF document text
    • http://jaika.in/images/documents/files/xiragevapizedosez.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f69010e818---kuluzajirefubugijadis.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/60406120322.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/67775902478.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210519133717.pdfIn PDF document text
    • http://clingac.com/d/files/9056911005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=atmega8+microcontroller+programming+pdf+downloadPDF 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_off0000c455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 16432 bytes
SHA-256: 98570be054800ed54c42688a82ceb73f3acb7cb95a7a6d13511d225545f5380b
font_02_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 11068 bytes
SHA-256: 5d2b0a5be61ba225667fc76167fb624ca7f0102cab9e37a4f8db05c2a46e2c48

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