Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb89fca3ab25ff14…

MALICIOUS

PDF

109.0 KB Created: 2021-07-26 08:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4b37ec8c0aeb6a0cbcf2ef660f7fe34 SHA-1: abf4f06929507ee72f18e499829c08bd7be43912 SHA-256: fb89fca3ab25ff14079013ba6870b9fe81b7caffa8c40880f26489a16cdf845c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a phishing or credential harvesting campaign. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab7b096699---71713517694.pdf In PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da282d1340---68930135182.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084fd5a73b25---gapawomimeva.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/94102706072.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27a1c1e48---41134404077.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/gawukivofokige.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072f535ceb00---soneg.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607757d564178---59754708003.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/rotafikapebevan.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/wabojenawowikit.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2ec237d4dbef7abccb93695ba411bcb4/33633400249.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/regevu.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/jimozupofabekajon.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607caea2e33df---tiwukabokaremidivuxezex.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/90719899832.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/fumopakex.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210725_213728.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/kaguzed.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/aq1esluqenok8opisuhb6at306/zorenukesezutamiwum.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/fejesifedumavirox.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098395f82194---80850704150.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/42036809037.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd582e942b---pamoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=guia+ipn+2020+pdf+descargarPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128ED 10912 bytes
SHA-256: 0f56ba778c38679b4c71f3fdf35d3ae1af2c5f9ac4cb760957f382aa48400b7e
font_01_sfnt_off00014222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14222 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084
font_02_sfnt_off00015776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15776 20108 bytes
SHA-256: 09753f971514c50e003689dc92b167cad0d9c39b67b2833933e6f093433a7d48
font_03_sfnt_off00018b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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