Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f4d08157973709…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 07:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee6663c7899e89c292c326f72780869f SHA-1: 55d1138c7028130a6e7418b6df95e62fc999996c SHA-256: 89f4d081579737095e886ab257502639a028b24f532e2745c6c191c2af37c284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://wastran.ru/uplcv?utm_term=pdf+file+to+word+file+free PDF link annotation
    • https://fetogram.ir/images/upload/files/53324504698.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/90210617649.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d2ed3e3d7c87f6083521db136b24145e/moxafopawegigos.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/pgd9hk9vb6hh1hsntl28kpto1v/nanexazepu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k6gvjle5imj0unts0r43cuuf42/motimipatorelelajo.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/pamisalenomadononuj.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/91090957010.pdfIn PDF document text
    • http://planbmedia.hufiles/12357988045.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dda3bdb323---46238057487.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/banerejarapobisifoxi.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202108201438022638.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/37888517553.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/6383712968.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805cfe5c6f9---tuximonojafimel.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9be697a2adabd53189eba6ffcdb62313/nunesekofidaravaju.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/1078709153.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/16391542560.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/35321101011.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/5htt6dgn60jkaaaqo81hi4fnd9/10673792568.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/fogurul.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/97826455165.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/7570831401.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c91313c3e6b---linabofu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/kujuxabu.pdfIn PDF document text
    • 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_off0000d21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21C 16872 bytes
SHA-256: 8452c50905ba6eed13735c6c318921c2f24d344ad311dc8c7e924c5653bc59c4
font_01_sfnt_off0000fdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 10000 bytes
SHA-256: cbcf909d5e553ff6277f6bb0f8ba2a803b0e8d0feecad710d64988a1ce3f5d90

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