Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cda00ced2178fe…

MALICIOUS

PDF

95.8 KB Created: 2021-07-30 11:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3f3492779cf9a14d13442d155ca67e7 SHA-1: ab6294dfea73b5f64affe8411c0e33f0750e8478 SHA-256: c1cda00ced2178fe7d7fcccac992bc200498a71d8db4684aeba79e8422940608
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 or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf32c8e0db---tanowo.pdf In PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/mupatoxijig.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160701b91e9ba2---10928560106.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/dipazare.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/musipamuke.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/datakirulugifavekonetiwe.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7195b84b0---vurawopixovi.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/rhfg6mcdo7ggeh3v9roc2nreq2/bipulilopejutubuvugiz.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/jizimugifiriluxaniridodel.pdfIn PDF document text
    • https://ferropula.hr/files/bubisiminubukufig.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c6578d9dd---77566674481.pdfIn PDF document text
    • http://dgjst.com/upfile/file/vojefujoboba.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/kotafunenu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/d68895aeb84100e5a9989338bf7d106b/darafakakinosera.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0dc71a4e4---duvivapewizusafus.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/soviwaxebivakote.pdfIn PDF document text
    • http://praguetransfer.com/files/file/80678729699.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/zigemifedomavojoruk.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609480406ae9e---6271424433.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/11190531a8274888553ff91270e639f2/busurudemexemadub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=harry+potter+and+the+half+blood+prince+book+house+edition+release+datePDF 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_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 17880 bytes
SHA-256: 12f0f950913d89287107c608721030cfa3544100a85c10c5a1759cded123c512
font_01_sfnt_off00013c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15455 11152 bytes
SHA-256: b622abaae35b33d598b5f9837838c5dd446a3f54243788dafc6c87f00c90732b

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