Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a351737f033c69…

MALICIOUS

PDF

91.3 KB Created: 2021-09-06 12:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa6b5c408388c3333f9561d8d9366179 SHA-1: 5b84c1ff19dfab3fe52be2759d58bfe362160b20 SHA-256: 11a351737f033c69a6e07d543e02d2f0e5cddde41d300bb308e87a77f6b98baa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a potential for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://rallyteamwalraven.nl/file/jakirotuzububamuvum.pdf In PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767e2470363---sezozu.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bedc0b64ddd---nesuwitulunigujez.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/97677242556.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3grfir158lhumug8rm2kobt034/64140592949.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a963113dcea---mikoxor.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/89962584480.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed3802142a---binemagavikewanepufonug.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/76eecf2f3cd768a3a421ad7b86ebf576/11131038049.pdfIn PDF document text
    • http://meta-min.com/files/tuvopakumo.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/443a4cfa97eb04ae9e7352994022e7aa/79820544174.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/4828179500.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/28094700045.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/75799904510.pdfIn PDF document text
    • http://halaljones.com/uploads/files/59047460190.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/6a0dp1urd6vmhedr34h1fr995f/xuranufalufexisugolito.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/bfd8f5adb7c40885388ced94100c3117/73592964449.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/90070996152.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/93511958920.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aa1b8aa490---22136034693.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fd672b561479758a734cfb55ce1168e1/11138625911.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/63e66330bc81b6e12b1f6eb52d7e0c2a/5266947592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=programa+para+convertir+pdf+a+excel+sin+perder+formatoPDF 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_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 11132 bytes
SHA-256: 4f6cafbc1cf0155160a5c8248aa50f09fe4f9df9750ee9e5d33b527e590e1c0f
font_01_sfnt_off000116ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBD 19112 bytes
SHA-256: 1b36ea2f5824b4a6dcc5cd96d7c39d9930eb8599b9fb2b4c30f5664629eb2ddd

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