Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4ccec7a70e3c17…

MALICIOUS

PDF

75.2 KB Created: 2021-09-07 21:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54554774b6d44d718901c3d335270ab5 SHA-1: 527fd858c4e9e59d55e08dd4bbc2f559af8984f1 SHA-256: 7d4ccec7a70e3c17d514f7678d116a5fd49ba0f7a88dd8b37458d50628830047
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=ditch+witch+jt20+operator%27s+manual PDF link annotation
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bed788c38a---gumogepukajor.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/0cc318f29e9ef82f0c7c8c7e163a777b/sazurebevotu.pdfIn PDF document text
    • https://atl-50.com/files/file/molapepikurugajebupi.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/tasegafi.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/83943299596.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/dedova.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210825_005221.pdfIn PDF document text
    • http://millecolori.it/images/file/pakud.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/53071131441.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/1954a2d547a9c81e2cfb482729daadcf/bomogamijafemojajidapumu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f38cc6316f---18468231866.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/6072787794.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/94422964142.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/vamom.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6422c182581f97fb1f84d8ac9b79a012/jiwifivulezimuti.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/9951c97eeae35dbe0fd7df4f7e54a13a/rurodapusuburit.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/77388356294.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/modumesob.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fe3e7055e---21418221897.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947fa1ef5e6---lowuralukepipavepu.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/67489401c42bb319c88272638953beb0/60715142154.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/714e5339600920f18db91e6a6e3b6cd4/woramidemake.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/6ae856613efcbfb1e1eecb18b8ad60fe/98886676681.pdfIn PDF document text
    • http://blatt-gruen.ch/files/6793068958.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e382a6c2cb---65180816530.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_off0000c237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC237 11232 bytes
SHA-256: 24b08492b2044a22fd174c04ac67157e0fd98c41e943584a3a91e2c6ebcd8a66
font_01_sfnt_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 16324 bytes
SHA-256: 414a0f2d4b1972ce5800668337ed5ea91974ab3e9e8292f25b94443304d8f20c
font_02_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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