Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9497f631592286…

MALICIOUS

PDF

89.0 KB Created: 2021-06-29 10:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: beed58236a3bddcd9b2c02a5d87f2f9f SHA-1: 8e289d1cd713cd2b7855d339f15ab70758034d92 SHA-256: af9497f631592286f269ff3cf5045390183d885fa8539722cbd7d4f7918ee257
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to potentially compromised or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the idea that the document is a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://muzeumkonstancina.pl/attachments/file/51384611919.pdf In PDF document text
    • https://nslogisticservice.com/userfiles/files/binejonakagamiw.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a1042bbc9---31852804086.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/duniguketekisirubederidut.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/mapanavixaxonowigede.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c55d3afa7---26942992129.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2ce68b07f---bariwokobaxuganisolexi.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/95448491898.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef10be308---93123442923.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071910908fdb---72247963329.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/sonoboduketakag.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/23549417437.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/27134005978.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/l9cf53k5beumsalg973qosshdb/kopabosazirokefobeliv.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c29b1beca27b556cda750ce6fe32b589/xanoxulavupalivigezozi.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gimikuwuxejevajinuvev.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c729821159b---68682414613.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084c722472e9---49158272002.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160942815a8f03---jutemugogatataxotavadurib.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091af173f511---10079628749.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/buforaxumig.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b852f21ba21---84220764826.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ae620fa7---97368402956.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/3a15812ef696d10cac0bd0a05456f394/65429016269.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/99670221481.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/wafajonajevenerewiwopuzub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+transfer+word+document+to+pdf+filePDF 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_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001105a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105A 17008 bytes
SHA-256: f48febb12a7fa1e6a8fb06655069b6e46405c50c0dd6309b63bc28f6e432c163
font_02_sfnt_off00013cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC9 10956 bytes
SHA-256: 8647ff7f495c521808dc92207882ab21037b9e0a3fe74d821eee4dd71bde3734

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