Malicious PDF — malware analysis report

Static analysis result for SHA-256 d747c189c1c9cfde…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 00:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac048a09273b5010ca2ae83e558fd53f SHA-1: de947610e29927078a74a6b5d188986ddfa6be95 SHA-256: d747c189c1c9cfde0202b873bf10126224347640f5050aebd0ff3d8fa10178aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised CMS uploads. The document's structure and URL patterns suggest an attempt to lure users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=black+butler+kuroshitsuji+episode+1 PDF link annotation
    • http://nepalbestcargo.com/userfiles/file/34440884023.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/jorerevafomutibuxokezonu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee435c8910---23046838346.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/bomelup.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/fepuxewezezoseloxilu.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/lasepasisariwer.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210907_D461879A62420D4D.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/becb8a09dbf628e197d0afc809be759e/47080592585.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/50796354635.pdfIn PDF document text
    • http://ibb-online.ru/f/file/58511501287.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/69442830665.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/76487311317.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/10091371769.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/jonerijiperanugejodilofok.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/sufefigiwajipele.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/soregebada.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131914caf8ea---78387621757.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16144ffb1ce121---73740616167.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/18074273905.pdfIn PDF document text
    • http://ndt-ultratech.com/files/xirojaruropew.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c43c754693---wugip.pdfIn PDF document text
    • https://campermagazine.tv/public/file/folelozaf.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ronoditisojasijolib.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/58381986699.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_off0000c86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86E 11076 bytes
SHA-256: e4dddcf24920ca527894ecb130d456767dbb4bcd53ed9c9d0314795e2dcb08f4
font_01_sfnt_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 19380 bytes
SHA-256: 76826056f3eb4ccf7264ce90d69bf5b3d7f787daf707a85035b7d9ddf942701d

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