Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5950f7e2bd5a608…

MALICIOUS

PDF

115.5 KB Created: 2021-08-20 19:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2d02eb7f1a1eb39cfe5e9080bf2af0eb SHA-1: 14d4664dec1410b05ddf5786f85bd052bbad570d SHA-256: d5950f7e2bd5a6084648c5237d7c48991b882de087bd3a56b3c87952d9456d0a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with phishing campaigns that leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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://krisoc.ru/uplcv?utm_term=inverse+functions+worksheet+with+answers+algebra+2 PDF link annotation
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160fc726deefd9---40486772860.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/dosumezepovoseriku.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ac0520af9f699b2e3ebddd28e9e0e67a/lobunakuwara.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac7a1b4b8---32362500293.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/66572926685.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f294a5052---bagokagigenoliwig.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/41039158253.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9c74284f8---28635025210.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115c44420f24---99558012031.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/p9blqi3u8jsegfqg8dsj5onr4i/lenunuwodu.pdfIn PDF document text
    • http://slsnn.ru/content/file/fetofafiruxibun.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/27abeabb8707f3353bd49025be9aa192/2058292392.pdfIn PDF document text
    • https://subarini.ro/mm/file/9620171921.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078221bc4e4e---zadesexifib.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/feguludaranegepula.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/11081203773.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/16856303966.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/zuvadivavorawowif.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160898c57dc6e9---vozegido.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a21a3b96607---dizavofijufewumixutitumo.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/lc2jtc7v5fndd22nihpunvqfd5/monepoja.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a220d5736---ribojukowovaw.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000185dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x185DD 16448 bytes
SHA-256: f4bafce8ec4a65a141132a851f612f7a5d51d6db1557b6c582052404415c29ad
font_00_sfnt_off00012f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000147a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A6 23132 bytes
SHA-256: 754677a5136bebe6b9fc3fbb829d853093d19bb9091e940c638d4a7010ed66e6
font_03_sfnt_off00019cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CBB 11172 bytes
SHA-256: 569e8b514a5eada7e226a61d456747dad14e2e84af5b930f5a8204e764eb53ed
font_04_sfnt_off0001b6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6EC 1768 bytes
SHA-256: 5a3c5c3117b7143647002525b904aaa1a0b2660b37ec7534c61bb34e5e7b7e69

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