Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94dc2f1b263066b…

MALICIOUS

PDF

74.8 KB Created: 2021-09-09 05:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e88cdc6e7fcc3d91b2d00e5a0a55394 SHA-1: c2c4f69d85c049cb70ae8b8cd42b40a71830495a SHA-256: a94dc2f1b263066b6d99a7a0f7098c3d25c0101ec10cea7fbc02b6d75136c3fc
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on compromised or disposable domains, suggesting an attempt to distribute malware or phishing content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=secure+vpn+a+high+speed+ultra+secure+vpn+apk PDF link annotation
    • https://woft-dining.com/webroot/editor-uploads/files/bibipimuruniwadarejud.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/febofowi.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/muzeri.pdfIn PDF document text
    • http://pedraferro.com/files/files/25863624908.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/pesopi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vl5036hil8nsk74thou00ph6h0/kalosapinadep.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/nepajofumez.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/79470999246.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/bulujufewesipik.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/xanekevomemib.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/55809718369.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/33654387466.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/buzilabonotakupalasaf.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16308944243660.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e307dac6e.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/70429611971.pdfIn PDF document text
    • http://cy2hand.com/userfiles/68498724726.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7412ad163920b17597af2eda0e3a0160/84620020277.pdfIn PDF document text
    • http://ruresept.ru/files/file/pexajekusiza.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/22ttmabfhiki6g2e1v5tu18alh/87092057714.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/52135789505.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161334a4a98f97---36473551958.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/juwevafiz.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/gikakegafed.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613900fdcbd2e---ruwoxenip.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_off0000bd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD55 18084 bytes
SHA-256: 414035fa6193b276eeda4bd2e6a37d7ba81fb77410180170cb032c1f167a1ec2
font_01_sfnt_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 11004 bytes
SHA-256: e69de30935351cfae68e72a6575ee8d869b2051d797cb122d1d30930bd04c8e7
font_02_sfnt_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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