Malicious PDF — malware analysis report

Static analysis result for SHA-256 c642c1c86b449784…

MALICIOUS

PDF

159.3 KB Created: 2021-09-06 02:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04113e2216b489a87cca23ccab0a301c SHA-1: fea0d89285d50d75a95e012694513f6d4ccf7d22 SHA-256: c642c1c86b4497848b902248883d72c7d543db9475097128e1573c35d26f187a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8749

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://samarpanbharat.org/trila/userfiles/file/73449939937.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/06c2fec56040cae58acf4b862ff1c950/gaxadujapatokoritixipu.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f80122732---40331227113.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160982a80a685a---rebejuvamerejib.pdf
    • https://akapacha.com/userfiles/file/67092028932.pdf
    • https://aucordechasse.fr/vosImages/movixatowefemibelexule.pdf
    • https://lenaoyunlar.com/calisma2/files/uploads/desefabonudiz.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/nuxopofuzozakizut.pdf
    • http://www.findvoters.com/userfiles/file/75532229130.pdf
    • http://forter.vn/hinhanh/file/6959172222.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cde6dbe6b74---palejododebafuvapejirox.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca1dbc7235---dabij.pdf
    • http://hoshitorionline.com/uploads/files/viwirezodojomavuk.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161192b6b536b9---34662612562.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161167ef4c5123---12088256081.pdf
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/53768299586.pdf
    • https://nadinerogger.ch/userfiles/files/tidonofevi.pdf
    • http://wanyuantemple.tw/userfiles/file/nibemomubirozajof.pdf
    • http://sanarina-coaching.de/ckfinder/userfiles/files/duwojopefigatatogavete.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa931a53ad9---52866980892.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608318352e4a5---fodazutoxadomoxotat.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ea8b01d0e4674009bd3ee8647e0c1829/24005786290.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c5dd8c858---53467339082.pdf
    • http://maginsaatmetal.com/resimlerfiles/90775412177.pdf
    • http://markasib.ru/ckfinder/userfiles/files/87003205390.pdf
    • https://ebooksweb.net/files/file/vifezezomupovifujivasiw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ayat+kursi+dan+terjemahan+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00022593.bin
8a94d21f7aa7e5f57371f6ae27139c65ca1361009a7066f3a38623503b13bc8f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x22593 27324 bytes
font_00_sfnt_off0001d124.bin
03eb4cc1e919719052cacb9afe15dc690c3f5575ac5035bb35a79d41649d30f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D124 18216 bytes
font_01_sfnt_off00020059.bin
fdce7a5c362651cb5e44e74025afd11634d2535af7674e4ffe2a613fdd08d939
pdf-font-stream PDF embedded font (sfnt) at offset 0x20059 11012 bytes
font_02_sfnt_off000219b7.bin
98482d09dad0131b70499d2c52359de766f84174e8f46a27e7453b48aa5ae294
pdf-font-stream PDF embedded font (sfnt) at offset 0x219B7 2904 bytes
font_04_sfnt_off00025608.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x25608 16792 bytes