Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5712d46b26c377a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 23:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 34939765be9e71c66501cffe71cd5606 SHA-1: 1f46605e5ac8eff54ceddbe595cb234bf0f73faa SHA-256: b5712d46b26c377aac7c47594131c9f26452adc9fc866caf498624de1878c848
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.masozilina.sk/ckfinder/userfiles/files/pudebijogujuvudasonene.pdf In PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/52659256663.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/b44a93a4f3452b6ae34c1ee076626e6b/subure.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/357aa4b41f8dbaac590f50aa48083cc3/wupawokitiwegote.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791f864ec04---tukajogakikidimomevuvilut.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072170d9cbac---kigulisebosipev.pdfIn PDF document text
    • https://fasleh.net/Files/files/gelinajeginiroxazujitusu.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/6911963965.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/5e2ff6c0ff730e4b2ee38f991d664c61/bojokazalomog.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/voronojadedurazufa.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/giripi.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210829_1B97DBF01B39585F.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e0a25262c6194b29bd36b92ea47fa8e0/kiwelomoli.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/goxegoxerefiwogo.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/78712f568b743b4f803f6363d1a8772b/53454619526.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9e6a4e0fc6ede0f1d091eaa041f5b069/mogurobavebesi.pdfIn PDF document text
    • http://badgerhillfarm.uk/lifijofuzigawegunobu.pdfIn PDF document text
    • http://gibisch.biz/files/files/fawunovifimosato.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/kozuzemavibuloxonexis.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/kukidewemede.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/73588093686.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/d622j153q6n81imtrmg0ut5jp1/92481271288.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/qcptrtj9v2534k1e7hit8fjju3/77707958054.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3210bfdc0eafbce9c512f0a36eee2fba/dezesivajomufaxurusujaju.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/fofakiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=jet+engine+design+book+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_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 17264 bytes
SHA-256: fd0ef1d2ad384a583d3bd579966379e5c760b99c82a39e1ed310645d20f581e4
font_02_sfnt_off0001247b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247B 10588 bytes
SHA-256: bd44d729454e38d2b5154fd1e5829eb2ef6d655350e309e33ac81c1cec8690d4

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