Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3912d85c85a1d8…

MALICIOUS

PDF

82.4 KB Created: 2021-08-28 19:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0ce237d763c6f2bef91a6fbef7503df4 SHA-1: 1b7666167ce053ef442f02ac3b8a409fc76afd70 SHA-256: dd3912d85c85a1d863c0cab433af42f06db9b09c2c1073f7e7a355beadde730f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, which in turn host other PDF files. This structure suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, and the presence of embedded URLs aligns with the spearphishing attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=blond+and+blue PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072514ca14bc---tarebobezajaxej.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/66873262787.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/68c62f1f4ba3525b50787ebcd45ac1ec/zifaluguxoto.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/86276173957.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/89908693119.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/xonosi.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/maxafefibu.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/4c16aa6ef5c1bf0b51560fcde4e8284e/74036391185.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161110cc73fa20---bixejogojewa.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/vvrl3m049adpbt4t4asmv31400/vilaxozevuba.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e0cc510f0e0f18e6b512119c804b2c16/tevirevarabafitiwusi.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/371ad91c107ec6ca2502c1bc98455bd4/47103593295.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/merujojakamowiso.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/bebajufulemofulu.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ef6451ceb77788b7cba4e9de83043c29/ronifunemefawimazabit.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610934acc73d8---bikuzizabazas.pdfIn PDF document text
    • https://aedwea.com/upload/foto/30761260829.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/82278577089.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/wobujigubarewadetidux.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/pezulegarufaxogo.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/gumirosikuwemesimikemez.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ddd0fb3c---xixidudamudafelupakisep.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/64566182010.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5b0ba4b4cba6ae811ab914d53c35ee2d/64523079969.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_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 17984 bytes
SHA-256: 5d82ed89dda550a619c1b3b5d1abc1e40315abe21f7a6de1d2a47ba6b6f52300
font_02_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 10076 bytes
SHA-256: 431f13c6c64c6f336b1c9bac18ea851b5eacd72f8d0378907cf024a8521a2448

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