Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fdc4b5d65e8485…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 20:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2ab05073dbf4762a73c041347992f4a SHA-1: f3d7088cccaa326fc9d067833bb21b7eeb0a645d SHA-256: 83fdc4b5d65e848519439928dd4186824e0ab67f057f1975720895c6255fbc21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b957e1f1740---93281337197.pdf In PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/movarises.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/64813763884.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0c62f0f4d---25481963300.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d5bd4163d169fc20d4712a6165511e9f/bogagaxefemi.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac67e655bcf---pilinata.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210901_143826.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/mevogimerelabasas.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/17092314577.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d433819e2---72801875775.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/72421628021.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/3960746868.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/kuwogenibidoditigopopip.pdfIn PDF document text
    • http://candientuvibra.com/images/file/41459106065.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/moteritokonepip.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fopesidev.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608137afdbd26---vuwulesefut.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8bb1851a8---63531018207.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/19338238335.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b586748aad3---fufajizirakadafobu.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/vesada.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/wonix.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/40902379046.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/wixaxuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=meaning+of+butterflies+tattoosPDF 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_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 10624 bytes
SHA-256: eb2a863f088f8a093a10a28b7f291d8b01fa448b61a6d31cb1198d831f88c47c
font_01_sfnt_off0001008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 17300 bytes
SHA-256: 62988b73aebfce970b1d1fd9c0608300d053babff361b47df7b527e447fabfa9
font_02_sfnt_off00012d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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