Malicious PDF — malware analysis report

Static analysis result for SHA-256 effb21ceda600eba…

MALICIOUS

PDF

311.0 KB Created: 2021-07-29 22:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: a2e540dcf23c771a6dae37d6e0bfdff9 SHA-1: 3f277eb9d9b2822b0f602f592adeb671140833e3 SHA-256: effb21ceda600eba4e1cda19834e0e5850b99aadccfacbca8ff0ece573e01446
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous links, many pointing to compromised CMS upload storage, and uses an SEO redirector to lure users with a 'free download' pretext. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8628

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e9de3d2d870bee9954d195f5545345a1/62687822285.pdf In PDF document text
    • http://ed-web.cz/userfilesfile/lotigezijuterewexef.pdfIn PDF document text
    • https://latework.cz/soubory/61174900738.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/4tp4sbahspl3n5imomf016uccd/69604487268.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998d7c6b4ad---94150824280.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/92585872865.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/retamokavujujesuma.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a6c8aca3---mebumapovilabaleruwoxile.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d074a59fea---binevazezejorovines.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607df07b35ea9---11519520153.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/pixuwewozugutivodofan.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/jawupukapizavovaxamonibu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c525ba3f13a4f10984ebd7f72603aaa5/xebakotapobew.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/52313677571.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f71a0f7da8c---lefazo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898c1b8d725---67032721480.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/laxuburanunurujol.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/kepudibinaji.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/89056950848.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/butakimufowirow.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e92a219fd---vawudavikadikoze.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/tuliduxuga.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/38213799173.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a107d3250a4---97253287192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=biologia+molecular+da+c%C3%A9lula+6+edi%C3%A7%C3%A3o+pdf+download+gratisPDF 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_off00045bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45BB6 23556 bytes
SHA-256: 95b74f08848263a7d2582aec2dea3bbacafd1139940746ff0ca3ed59f8791c03
font_01_sfnt_off000494e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x494E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0004acff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ACFF 11988 bytes
SHA-256: 85a45480f9b09dc8aaa1c9c1c697d583f23ea5c7427f85603bb17697a7a49c62