Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c495f265fb02b49…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 13:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31c560fa1af1ab34538d2b05be7ddcfa SHA-1: 429200b86d27a5f292c7409b97456d75658d1a81 SHA-256: 8c495f265fb02b4984171a5bcd74b9883edcf5847e4f752692cb962331eddae8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The presence of these links indicates an attempt to redirect the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/jo0g4l0smkne4d5cg6unpimk8s/90335876580.pdf In PDF document text
    • http://bettynblue.com/upload/fck_img/20210707/file/munanisojonekonov.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/30176948125.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6e47f513---roxavomiwexipekis.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/72866852382.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085368da7afe---64460950389.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/9d2b728adf19a68e651e26dfd12bda8e/321024307.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/82827826858.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1f0e508449f15a60326acee6ee8fa51d/medisifudurazomi.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/ruvob.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/53250119346.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/85120281424.pdfIn PDF document text
    • https://digireg.nz/upload/26280331644.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/43637913573.pdfIn PDF document text
    • http://vivalepurrexotics.com/clients/2/2f/2f65fe2011b8f0b07f64c29a74835a02/File/tamikowaxubu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf02a26ecd---tunojotoka.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161247bdf6262e---29033571194.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/44105539922.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d501b3659---67982321289.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/74475526513dbb44135080f148734ec5/73055434418.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/kibelilowanikavizebogami.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb3bc7f781---65866959550.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/l38hm0gmq7d2o3u5vap1if5osm/dopagulefexivajola.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9383775385---sozagesulexumepojuzomure.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/sedaxuzugewagiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sindoh+3dwox+2x+manualPDF 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_off0000bc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 17544 bytes
SHA-256: 858a804d728c2d2a4a173c23a57d80bf190e83c30730f26900aeab6276ca0d83
font_02_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 10672 bytes
SHA-256: 56e84d4b699cbf16d091a8105d2060a133fd234cc60201d1557cff69dccd9625

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