Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e85980b95b10f23…

MALICIOUS

PDF

85.3 KB Created: 2021-09-04 13:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f2ad58b9fb6ffccce4bb14b0c05890d SHA-1: e73e57008be86e732ac79acb61965fafb2704106 SHA-256: 4e85980b95b10f2305acafacc07726b326836cf4f5d1b7377af4dc954271ef77
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the heuristic findings point to a pattern of hosting malicious files on compromised or low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://secretlove.ch/ckfinder/userfiles/files/89340658520.pdf In PDF document text
    • https://csodamalom.hu/files/files/gasarapajogunomemamemimut.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/luvepitasavikole.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/59544659255.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/29795093671.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088401556118---tupakosimutedewesilitelok.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/aaf422035cda27a5ff6f7bc38b7c90f0/16387587012.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/13697895932.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e052762287f---xapijawixetu.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/29614835757.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/suwuxow.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075113145a2e---22983029738.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3976566f8---26458010316.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b93f27adf3da3edfee32958bd71cf77d/pavumovilopuxatibav.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160813520f3ffe---64582457813.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9f81d65b2fdf532fb8b7c87e97e3a702/20344512238.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bddec05c7---65323416651.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hm9jiqh1ml698p3psgqnksr29g/futawaja.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/garepupilorogiz.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/65366616808.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/losebupa.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/87957683555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+do+we+know+about+fireworks+worksheet+3+answersPDF 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_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 17300 bytes
SHA-256: 9616305e4c8493e7f57a7e8401a4aa12fa703763a6f06cf08e0a6bc07aa9cd35
font_01_sfnt_off00011400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C17 10988 bytes
SHA-256: f09eb8784263c6119eebc5d87b937aa3d0eb94835fa1974e17768f6b357e2140

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