Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0e113e40eb94ff…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 01:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9cfc371ed2c166a1374c70ea08747fda SHA-1: 18b798caf147386bb3011a4c4a2e8cdbce74b103 SHA-256: 3f0e113e40eb94ff8ef69a6bcc493e7b62056d0e8862b262aae1ccb545ec00cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm behavior are consistent with attempts to deliver malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://telek-trans.hu/editor_up/xedekudolobigivav.pdf In PDF document text
    • http://technoculture.cz/admin/upload/file/89838171722.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/rubarepe.pdfIn PDF document text
    • https://iword.de/userfiles/file/sopexagukagamadu.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/05bc9c6a1a8558a8b10a26418cbdb4a6/bifunisibapojevakuletu.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3761781b9a---97639106543.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/vokelejapuvozipugupa.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b153c8a9ccc---14002238557.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/5803172734.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ah544eibigvgtjiqfj822tlnv3/5739772964.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/bimemukalenapobiw.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78d0646189---pisumeros.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/nadafovinuwepapujiv.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/41349528734.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/bb917367cc699b24193ef0404f796dcf/vudijulevijulof.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/godipokevonufejajapa.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/83227629138.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210626031858_995301402.pdfIn PDF document text
    • http://desertofohio.net/clients/4/43/43f38f6e2239b09326489e1ba67fa1b6/File/77410357535.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/94125413884.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/16645028703.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f3f1e14c2f886990a827054c786f365e/58035235381.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161185bb17bc3f---23131336301.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/96988196658.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/44276162947.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/lubirafomaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pdf+viewer+open+source+webPDF 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_off0000d171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD171 18296 bytes
SHA-256: 276c96849725424af3ef1a062e947685fd5d33569c4121187165fb70d47c4e52
font_01_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 10700 bytes
SHA-256: 4be1886bf8548ba36b06ab07efcf47217abede5a4e7a845ac9523547d560e1af
font_02_sfnt_off00011992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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