Malicious PDF — malware analysis report

Static analysis result for SHA-256 963ca3ecd40c8bfa…

MALICIOUS

PDF

75.3 KB Created: 2021-09-03 08:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed7ef6fa73fd12073ab4c67807b5c9cc SHA-1: 89d46907b7700e059cca4696f8cbf66bcaf57ff1 SHA-256: 963ca3ecd40c8bfab2a1c0011f458895aa35e0c1b1589e241aa67ebbbd938ded
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=dorothea+orem+self+care+theory+pdf PDF link annotation
    • http://www.azurwelcomeservices.com/userfiles/file/85110776694.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/44708578830.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/gq7qg60bmvenic3hut8jpebf2b/nijawarovevanuvifafu.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/73019246282.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/20404010402.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/40600297509.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/j53jccia1j8t1cssgupmjacjga/95225036660.pdfIn PDF document text
    • http://reylab.com/userfiles/file/penidej.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/rujarujumomat.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c33a65d3---86650523966.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/18464795708.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fc5d66e87---6513084936.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a463b8b4ee5---bekejedigulibogumabepuzid.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-3/20210803132013278418.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/df50b07251ed13adc5eadb06608495fa/wisurusadum.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/rimodosibimopevazokaro.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6335cb6a10---77119366039.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/e5e185f7b6debfe43cbc750ba1c015b8/11994962261.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/pebolizisefap.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/1283628221.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/gemup.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/6s4h0qsj85cl52qmsajs150o8t/kidulaza.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_off0000c2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 10804 bytes
SHA-256: a7ee8dfd7a8603533ac58567302ff0f16e03fdd9a3b31064c63d14c49ea60dba
font_02_sfnt_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 16764 bytes
SHA-256: bb3aa6243cb552068da96c46e2567f8a5c992c510086a0e0c150f91c078ee82d

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