Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d3395a21d0a80b…

MALICIOUS

PDF

91.6 KB Created: 2021-06-30 23:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0f134068687cc02d491e190775b1561c SHA-1: ec86e728d1ef144d2055a3c2d42ea7dbf908509c SHA-256: 42d3395a21d0a80b76b24c669b569b4281f0d1a9f6901ec7b7cfbdc62c7ab712
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/hkgg5q4udts9c21j9kim92kqqc/6834105862.pdf In PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed53b05a5e---girakibepajewi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/62b5dfbd203bf91775a8e26c5955fd12/sevuzonos.pdfIn PDF document text
    • https://goldenapp.net/file/12621260840.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9506b79571---48674539591.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608975a002159---xulogam.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/kuwepepirejixatanixer.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/18714943024.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/vosipis.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/25cd2468f4491fe690b9f1af95a1651f/91804442069.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/fdencg9hs7qe6faclupc2eoi0l/86123907082.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/45566044849.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd0c7bdd8e---josexusesuduv.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/2309022677.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160841d597e432---jelik.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5d50b35331934bdd15cbb9a853e1b642/wumoridu.pdfIn PDF document text
    • http://amandamaitland.com/images/file/tasovikivomenabibube.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ee022437---pazotubogisopefeda.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d573b28b02---93577317980.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b821420e168---42301965081.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/24412515553.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607559fad17a3---vukafe.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9eaef3a2691b79705d4639e39e277933/5226606528.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c4a28ef0b2c085f7800a895b55f5349/jifinexizuwu.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/310850474575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=red+ant+problem+in+housePDF 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_off00010203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 17628 bytes
SHA-256: 6a6bb5045b8154eed5184c92bb0bada92fedfe526092f9e9a28ba64dc22ccb8c
font_01_sfnt_off00013060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13060 10944 bytes
SHA-256: fbaf8c1bc8fe5438d1171faa0433b389818e7f4b24ef9960e12a72da82f9fc71
font_02_sfnt_off00014943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1