Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf488544638f91ef…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 21:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ea0fd6f006a129091266e28a8c8c02a7 SHA-1: 9036d4cd4aa123d583b144fce6660b2978407f34 SHA-256: cf488544638f91efdc4279e69a65455b7da2b02e7406f1d7ffcf5a93d054e37f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or link farms on disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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://synerhu.ru/uplcv?utm_term=healthy+relationship+quiz+pdf PDF link annotation
    • https://solidpractise.com/files/userfiles/file/59211216564.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/27485506669.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3787f0e69---tokekovutexijo.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/u3foj76k7h8nbjeu888u7d7e6o/52615741035.pdfIn PDF document text
    • http://ausafe.net/images/art/files/84970501211.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f149207460f---59695653882.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/jinidaxami.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8cc4080381f12535abee2f7ac78f3636/torebilujizeguzofalukali.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/dukutev.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e033a783f---17326641989.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/fitolupeb.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/10341309330.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/64138351947.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/93465291987.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160f5baea59df1---vujurotinabulororil.pdfIn PDF document text
    • https://sambelteri.com/contents//files/mepibenumup.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c641a54616823a10947e362e6e9ef08c/84526688408.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e10ee1b484b---rumusula.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/10571401864.pdfIn PDF document text
    • http://willbramephotography.com/pulukegodatalofawoko.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607117d4a57cb---vuwunonekajaselewufavodam.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10851c4ba---jiwonuwalunow.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/78259823070.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/kedoruzojamivat.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_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 11008 bytes
SHA-256: dd5f09471d0b7db774e94da8ee05bb88710136425247923a368a5a598e7e2414
font_01_sfnt_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 18412 bytes
SHA-256: 8574a0970017fc765a87d0506920a61f520fbb9246afaeea1a57462f24f54835

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