Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd90d26fc4442b9…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 14:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 705e8c61284e6b63ee2e4f7dd29b29b0 SHA-1: d3a7c8092c3dadb26e17f55a141ae740797985ba SHA-256: 7fd90d26fc4442b94de8463f7ca8df1fa8a38f691f31c802b20e6ac937fed27d
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to other PDF files hosted on various websites, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nodka.eu/ckeditor/ckfinder/userfiles/files/17592121792.pdf In PDF document text
    • https://hondamienbac.vn/userfiles/file/rezoredafefos.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/debefabumotunuvat.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949a72caab3---38801210557.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adcb923aaa---fomamexisikukebu.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/98358180784.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/fepoxikizawomo.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b5aad861d2ff8d5f4e9d73db2d5d0aa1/wubozagazofidovekuv.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b907553b9a3---15867142024.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdadca3bc05---28387112053.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/8q1u05n426m6c3p2rf0t5if4bu/gevufo.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b0d2e553f---wagobodikefakenukovif.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/17324814751.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/zokiwoxuwabiludotus.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607604610c401---torotuwutizabinad.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/38n12n2va5pj9q7f42k7b7p2j7/6176080949.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/hbt7hn9o616mkbla23bgcs7fci/75846083517.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/romumemovagi.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/83673857372.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5f7be81c---41059615113.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/sinogugiduwopebulip.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/mowebubuzozapuvenobufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sleeping+beauty+piano+sheet+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_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 11104 bytes
SHA-256: c012dc387d4436f129f7bc23ce3652b56c6b16a9c64c86e7f84ee1e6401eaca2
font_01_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 17404 bytes
SHA-256: 75a191f35f7102a18a24040ab0e18aa3742397bea34b2ce3670036eceeaaa543

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