Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd1cb9362a51eb1…

MALICIOUS

PDF

85.3 KB Created: 2021-10-08 13:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6d31a2d16050295545026b720b558a71 SHA-1: 1b5212561d3d16000f93e496677eb223f029941d SHA-256: 6bd1cb9362a51eb102a2c8ff72231e79445b55018d9a1b5d198af3307463b700
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm pointing to compromised CMS uploads and disposable hosting. Embedded JavaScript is also present, suggesting potential malicious scripting capabilities. The combination of these factors indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://brukikostka.pl/uploads/page/file/wunaxiwu.pdf In PDF document text
    • https://eseninternational.com/uploads/files/23680454616.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/46354318152.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/xojakubajimijuw.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/5124329260.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/20167831508.pdfIn PDF document text
    • http://www.agot.pl/upload/file/fenitofarebo.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131a0100a6e5---tawopaxijobimi.pdfIn PDF document text
    • http://unsersohn.com/images/file/60613374628.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1614d76a3105bb---25006248648.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/zexokebaji.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/nosiverumotadu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e4b240552c---51850717092.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614101e99fe11---vokebomikokom.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/89803073679.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/5745517147.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d89fcc2b4---mipavigo.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/fanagapo.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210911195616.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/vegibazeboxilag.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16153ff2925f57---51143744204.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210918_020919E630F90BEA.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/miwavagaki.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/47954369544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=copying+is+the+sincerest+form+of+flatteryPDF link annotation
    • 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_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 11072 bytes
SHA-256: d0eb172739ab5a500c74f3ace1c5b6a9788d80c984073a71dd6d1e3b44795159
font_01_sfnt_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001152f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 19236 bytes
SHA-256: 7e2ca38d8ca703e295d650bcb81eb2e2e62b470577856d368adb1c685f5fe61c

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