Malicious PDF — malware analysis report

Static analysis result for SHA-256 435deb4104c9cd68…

MALICIOUS

PDF

78.8 KB Created: 2021-08-29 08:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b80e16863dab8b1cfb7c540d29a4cdc2 SHA-1: c111e591ca9e74cb22f9a62bfa52fc6bc7436af2 SHA-256: 435deb4104c9cd68f2d5082f09a06c689f50e2928fe995ddd103aeef48249b57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or redirection mechanism. The PDF's structure and embedded URLs point towards an attempt to direct users to malicious content, likely for credential harvesting or further payload delivery.

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 https://infrive.ru/uplcv?utm_term=detailed+project+report+for+food+processing+unit+pdf PDF link annotation
    • https://angkortaxiservice.com/userfiles/file/tonuvixagik.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/pc623a5e72of5l6c9bck0n4rnq/10512980968.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d30f640a55---27292313117.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/35653062065.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/36586435711.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f91a8ccf3---nokivilanememupotejig.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/birugexiburasidesudibewe.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a20e95f58---82298326902.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/50154069833.pdfIn PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/39772210825.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16093b20dc0316---vadorozakam.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/nekubawefovujomowujagino.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/619737419.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607092f473e36---bipezoxubikin.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/34155648571.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/95901850429.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e8178b090a5---18395531384.pdfIn PDF document text
    • https://fobh.net/userfiles/files/66447088013.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/qnopf78j4vstpe6jv6mone93c9/xaguxavape.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/ripuvegas.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/f476f9445db7ffe94e71cf5a20dacfcb/gusopobuvaxepofi.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608dddf518443---pukolubodise.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8954b258bbb678b4064b6045e05873a0/93097594312.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd4ea4874---71393827002.pdfIn PDF document text
    • 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_off0000d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 15708 bytes
SHA-256: 6373189f09a82dbbf0759d696306fc572a0007cb55ade505503a9f43bf6f4581
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 11024 bytes
SHA-256: 427f7cf2832e0e4ccb6a287a04b558c4f8d5f480dcf22365441f00abe6bb5843
font_02_sfnt_off000113de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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