Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b09bb4d4726062…

MALICIOUS

PDF

72.2 KB Created: 2021-08-28 07:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 050db5e122e3635ee71a04e06cb2cfc8 SHA-1: 6420e09fb1a56a6ee09cc9798ab1047c91197dea SHA-256: 78b09bb4d4726062059c429cc302f0fddab96fb526db02ca303c24ae875d0d8d
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of numerous links on potentially disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3c9e69f61---gezezixujiledivutama.pdf In PDF document text
    • https://balajitutorial.com/admin/userfiles/file/dorire.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/resedalajonubuwewazoj.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/59d774c7513480f87fd49fa07bb6d501/24739119940.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/86982892135.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16123c49d167c2---bolapezekodo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e623eaa4547---16994257416.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/5978482535.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/15601336201.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/kofebimadewinojokiv.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/67548811339.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/sipoguvonaxikisi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af812f8a8cc---babepunum.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/36008483204.pdfIn PDF document text
    • http://santabruna.cl/upload/file/zijuxa.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/72782211240.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/16349426829.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1e87b85bf0d51fe47bfa6117292d3fad/rewubevaroxuzen.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911af53fc1a---tunisiluxesuzizus.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/5902381002.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/71944335091.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/75961756529.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/64711529818.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762719eaffa---80795191748.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f997819b074---fitetemivagebikutinapad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+get+akuma+in+street+fighter+5PDF 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_off0000b924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB924 11016 bytes
SHA-256: a5ce7644dd81d2c628c58c04bd5561e37dc94ef57f3069d24959ccda3ab9773b
font_01_sfnt_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 15740 bytes
SHA-256: 285f11595d6035dd03ee26f0854f4b6e16a78b81358047b80cf3a6471f227fc1

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