Malicious PDF — malware analysis report

Static analysis result for SHA-256 336d1bf5156dc74f…

MALICIOUS

PDF

90.5 KB Created: 2021-06-27 09:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6267f7608849a310b5cdaefca01c22b1 SHA-1: 254c0b9e8e6b94c87c795685e026fc6f5f2c6e26 SHA-256: 336d1bf5156dc74f122f2ab22012a3b74c1bfc8311975311f2c2330d9d11d3a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9663d9b34e---60266665504.pdf In PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7bdf5d670e0b55877c1e3753dfff11d3/93535383979.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096bc6c142e9---gibigijibogularep.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/witobunif.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/13898227039.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4dd2dca104e7fdae55bac771ad2962da/86582190547.pdfIn PDF document text
    • http://centrons.com/uploaded/file/72802892760cbd30e0a606.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085aebc39cb1---71465818674.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073693541527---bivijibugelo.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb5245a83---18743509626.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ed3f348d5---30747220557.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/60f60dc4a0b6aa2cbcc1bf8601b379cb/93804511662.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2031a038c23603c56cc3da3335a45bb4/dawumewi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/pokajozibifujulesofe.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4e40e0c12---26354127646.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/kojafekava.pdfIn PDF document text
    • http://araonline.hu/uploads/file/36209953977.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/hul72fvfi3vu8knvtovi5g3oeh/domixokugiwex.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736e36175da---fidofitisex.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/n0jt2h8hld4idk18lm4ulgfo6k/julipiwikanidet.pdfIn PDF document text
    • http://iltorg.ru/upload/file/bikutunomugufigakezotep.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bda65afa9---gimoxidaj.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/bagesoli.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/dudepamuxotuge.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160945af29f7e8---salazisurolemunowererunuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=funny+lines+from+the+grinchPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4d69fe53f22805b89854246a90275b02/47092547583.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_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 17108 bytes
SHA-256: a7654d63fc5991616a18782214dd23a8648e86c35ebe255a2990417f5f452c43
font_01_sfnt_off00012bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 10812 bytes
SHA-256: 605ad14f049ebe3983aa42df2fdd04fde93fdeeb5491d3cc20e135b2a06f8b65
font_02_sfnt_off00014493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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