Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1332d3aaed4b27…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 20:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8174a93c095597b3169c152b40413ab SHA-1: 9494f0c704fdd34478d86a561b12360ab0df9d37 SHA-256: 8b1332d3aaed4b271654f9b1b7bf36d75479261a7ff489f1a7b9b9660df5e65c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The sample's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf95927beda---sowerigefapuzeto.pdf In PDF document text
    • https://naoshima-habitant.com/92629139624.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/bozasikowi.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/41457550201.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a654f19eb5---fikataza.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/xunuvegudixaw.pdfIn PDF document text
    • http://renknh.com/ckupload/files/62663130106.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1apfn9lvncmj9mnkbr0qherpe2/jawibujifofufa.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5f2b3743d---xobunipowubexorezofolivol.pdfIn PDF document text
    • https://nistd.in/userfiles/file/gibegafedepav.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/mudekilo.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/puresoligapobe.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/56298554835.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/e0bb5d0e5308af9bf93f01a42338b4fe/fovibanevop.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/befe97aa47a485cea464c67c90760c3e/xigudedagagizusizemavuw.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b748b3e1aeb---nedudajividowati.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160752d7d922a9---jusomonawexebeko.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b576ab72723---julizuromaxibixu.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/kokogib.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/95796266249.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/260b055d509773c40be19a92c84ee2c3/wirud.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/87019322861.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e2a7824e1---zujereraser.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a89d43ae348f11b24c94cc7e1d940a18/rafamovowavexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=division+property+geometryPDF 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_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 18120 bytes
SHA-256: 145567d8d3e7c3940d0461ce7e7c75778db0a2eb267335019d07c687d196ebd3
font_01_sfnt_off00011a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9A 10568 bytes
SHA-256: 8b1a404b75ab77354df192c426216e6588295b881b1d65386116615383d2a95c
font_02_sfnt_off000132c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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