Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17eace0e6d3b32f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 21:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a5b938c1ee966a15ee0ab0676b47631 SHA-1: 44e48f2f6a8b4893ef8274c6977675e9c596a308 SHA-256: d17eace0e6d3b32f32c98daf357edec937e264ff829df21832a945b2ddabdd0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=reboot+android+remotely PDF link annotation
    • http://khocabien.com/uploads/files/74358541218.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/45017348658.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://tinnituskozpont.hu/files/63695020645.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/73847390807.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210908133848.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/bubuvuzoponezazi.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/wevuminonasovekoturugeg.pdfIn PDF document text
    • https://alpinashop.bg/files/jexusefesiforusaziga.pdfIn PDF document text
    • https://panama4d.com/contents/files/jufodigoxuvajobikabufog.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/lovidivurunugulifun.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135047f93fc8---38033980065.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/29082772089.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/22740267599.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/76052897154.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/15068820115.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/vewevamajubuwedusoduw.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161387a6438e2c---50872547214.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210903190136177.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/legovofatukizemigusewisu.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/ligedominovune.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/78038050386.pdfIn PDF document text
    • http://vlajamo.cz/images/file/xidabizavizo.pdfIn PDF document text
    • http://momsystem.ru/public/file/gudanasurawixu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161314429e99c0---duzufovasuga.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_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 10540 bytes
SHA-256: e29307a54333d9dda225357cd7eef0b87ae0593c8e0d41f089391bafa129db5c
font_01_sfnt_off0000f384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 17152 bytes
SHA-256: 348643891612ef4aa403bd411241db46c5cf666389d20af823f42e30fe973cc8
font_02_sfnt_off0001200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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