Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f8d9c43769b59a…

MALICIOUS

PDF

92.5 KB Created: 2021-08-06 19:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da98ffc02c1aa94c09fc87baa870bdce SHA-1: 340ebcded9de38fb5d4dde4dcc6d2049dc17801f SHA-256: c6f8d9c43769b59a7e9893a9bfb0b370e6373cee99fd85467a76594b4323dd1e
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS heuristic indicates a high probability of malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://dogoxuavanay.vn/uploads/files/27675966766.pdf In PDF document text
    • https://sport-jicin.cz/dokumenty/48791005893.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/62828888639.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/xoterimiv.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/33846217462.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608473d2c0ef9---73950908269.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/187e57d3b04d417fcb859cfcfca1ab37/61446332168.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/42742692617.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/dd079c961f0fff397996e947c3a950fd/katizubobexomodidilep.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eef8b0923---95670113201.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/66818384617.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/300e1eaa8b5dc66c7ae475062ffcf172/wowoximesetikidaremusu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa025c8b9ca---libuvom.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/97883519780.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7750de774---4388982737.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/33713816316.pdfIn PDF document text
    • http://adveotec.com/img/file/pigupujokew.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/b0d8d599644b88ed23d8ca0f897ff724/pizorurim.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1mm5bb34rq5moovurpt6tn9j92/97772417346.pdfIn PDF document text
    • https://chp-travel.ir/data/file/fegesoto.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/49990842308.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bca7aeceb---lisosu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a8985b7cb---996955351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=como+escribir+guion+de+comicPDF 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_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 18396 bytes
SHA-256: 978bbd044fc8cc1360b366c85f58a88eb2a024ca14f7e2762ebfb68f9fe2c3e4
font_02_sfnt_off000149f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F2 10676 bytes
SHA-256: 08ec9e78a85f35a67d16c0a7528c36d5bb428484074d8b382394ebc4773513f8

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