Malicious PDF — malware analysis report

Static analysis result for SHA-256 71778a973e3627d2…

MALICIOUS

PDF

75.8 KB Created: 2021-09-07 08:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6bfefd8872629cae858c3644806c8992 SHA-1: 30db7794e35d6c89256fcd403767109f94e61500 SHA-256: 71778a973e3627d2b185df72ba5ad9b4135bc84c53c5e48ea35eb5700c97e14c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or redirection attack, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb1321de46---16426638585.pdf In PDF document text
    • http://ristoranteyuri2.com/userfiles/file/83794330772.pdfIn PDF document text
    • http://bscartridge.com/pic/vabenuvedesesifewop.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/gozop.pdfIn PDF document text
    • https://bczenekar.hu/files/file/wugebag.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/49785428102.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c8e696a4---pidosasujadirosov.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1f0f3a1d36e45e7f925f76132fd6db0c/xesifopa.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/86393296798.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3d7bfd51e4b5a829a6e8937a7b777300/87836115501.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833dc4aa2c9---sesixugumerunolugo.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/saxikokumabibubazoze.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611628a39cc9d---56297480481.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/75757119394.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ada7744b4e1525a261324b86c78540b4/xevofenalup.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3a2b5af40---tuwakatotelepug.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/majoxumad.pdfIn PDF document text
    • https://artenika.pl/fck/file/zifeminesezirasigefo.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944b59674a6---28988972119.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/lasitezebumaba.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93f51b04a5---jerisidak.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/joromifi.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/terinopexunenewaxesuv.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/ralofurosuxakadiramur.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/99359339169.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/4411938362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=normas+abnt+2019+em+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_off0000c5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 16432 bytes
SHA-256: 6f3a59c9e474b3eff8cf7bf90ec6d4adcfb7ca6546125efcaf721e31b557feac
font_02_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 11100 bytes
SHA-256: fe13a8ad2e3d2b91b0d25fce7fe5c4b584b76b6648c98508dcc5006544acb3ea

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