Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57cdc93645b22b6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 16:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f8ca4174d7119fb4abcd910ba927446 SHA-1: e8d4abf36f6fcd0f9b7dd03fba4d723f77df1512 SHA-256: b57cdc93645b22b6ebdcbdd62754cc14d03a89264a8cbe12625f196a1e2d55b6
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8065895aa---33772705182.pdf In PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/xuneronulesa.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/373e8163eb8b210a33578b55046c148b/bojig.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160911f42173dc---41795148991.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/gujiw.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/nurokugexar.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/71114065442.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/zarevagexomil.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/52182295946.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/fqfajfdhk9chf2rb42qcv7okj3/rafafuv.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/8828024037.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/rapuputisonu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7228f8c67e---78913577713.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/55882249538.pdfIn PDF document text
    • http://scantech3d.com/files/93399546502.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/gadovubodisa.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c0f5ae19732e68ecda5bb561f42c5c4b/varowawifafizagefe.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/23529118658.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/65509280406.pdfIn PDF document text
    • http://intertribo.sk/files/48473908299.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/62197220468.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609906147876f---tajesenegulamulibipezez.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c96ed970156---zugox.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a829321037b---metodozofininowakipopebut.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f5fd0773---xamobitapitutodosojifug.pdfIn PDF document text
    • http://princeverma.in/uploads/files/55638765546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=stephen+r+covey+first+things+first+pdfPDF 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_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 10948 bytes
SHA-256: 89f6961ebfe8f9331da40d71cf8bcab6a992a49c1894212d441a7b5370d46eb6
font_02_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 18116 bytes
SHA-256: f04a5278982a06f4675d6d0b74d71afa517dee069b4aa1f0f422b98ef8696951

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