Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d364e499e12dc26…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 02:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a21a3c532b7d518aa1c7a430b791633 SHA-1: de54ecb7aecde1b542d93057d53297f3881d9cd8 SHA-256: 4d364e499e12dc26db2bbb364918a428e06330c3fd96290d26b56513f2d5dd95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, embedding a large number of URLs, many of which point to compromised WordPress sites or disposable hosting. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070acfc9b4cc---fipewabowagumex.pdf In PDF document text
    • http://liveranigioielli.it/userfiles/files/68907131826.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/wexakenula.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc18ae21e5---57640372313.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/lodujudewagevafateb.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/karijafimilamebojevez.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/pakapej.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/pimexosadesipifosogij.pdfIn PDF document text
    • https://kaisar168.com/contents/files/tevanidilosipaviza.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c654b006ef---kitibobigoramusizow.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/43812909881.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a526c61a7e9---3522138534.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/4h7bftcqpjajff0mkammln4eo0/depenis.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/woxalezovujisajuzononu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2210oib0rfhdvqdt9locauoeud/mufapizebuguduge.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/g1m8nl9t4nofqtkovqdr1eqo79/82562216355.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/fe24c2c103b847913e084a0300d808b8/71137204957.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/tmb9pa60nale7a1spqjiptj0l7/80963936979.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/71229270297.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/36945417274.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/95538553783.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161276d27b7fef---wosuri.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081274505e06---2669885313.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/sazijabataduxug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=vacuum+assisted+hydraulic+brake+system+pdfPDF 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_off0000d85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85E 16952 bytes
SHA-256: 81267784e64abb83d0769502876427f525eefc399e8ed797eaddd9868c684fa2
font_01_sfnt_off0001042d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 11076 bytes
SHA-256: 5a6c72d7025c41b56184a915012a4c66aaab4565f0107a2c1bf0ec6f64a8257a
font_02_sfnt_off00011dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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