Malicious PDF — malware analysis report

Static analysis result for SHA-256 5621cdb17e673608…

MALICIOUS

PDF

100.9 KB Created: 2021-06-26 23:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90c6fc79f53e3f60db7c7f0bf192fc5d SHA-1: 696dec7077074cbc8eacce01098819e7aac47cb8 SHA-256: 5621cdb17e673608bb2915b2bf3d0c9641961a51aa99f8492c73467642fd2750
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://inwebjor.ru/uplcv?utm_term=amputee+meaning+in+telugu
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/9ab8adf355caece12b7e0e90b4044746/woximozokepupeguto.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9f3aa8eb4---42666507400.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9486f244f---70133173952.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9072260996---lokididurofilapef.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/75243244182.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/f2f3790c84d8772fc92b75b82309eb44/bisanuperimosamenunixig.pdf
    • http://ordinate-ltd.com/file_media/file_image/file/zidagudazi.pdf
    • http://alituncer.com/userfiles/file/25668976003.pdf
    • http://sys-svinding.dk/userfiles/file/jotupuwobejibakeja.pdf
    • https://twr1115.net/files/fckeditor/file/39799769021.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/gs1d8tb7f2d0ees69pdl06bv1p/kumilovibinimun.pdf
    • http://auxerretv.com/content/public/file/76822563364.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc248bdd9ed---dibuzudoridigubujexas.pdf
    • http://progfin.pl/userfiles/file/86364503868.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/60942a330cbd4681d7d6c1f01e7b9e32/zuluxebidobot.pdf
    • https://silga.ca/userfiles/file/91339636428.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/uf4g6ek93ahfirrg5m395rlk9m/89773002401.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/jemelumanow.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/merasovojidojarim.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/tilifuvu.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acf60e18a52---labikokifu.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4ed58e57a653a2485ad2d1f3b6024f44/52991808932.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d911594681865b8963a39107a342eecb/54566187100.pdf
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/11198529154.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076b9aea4dc0---maweguwurujosaxobuxola.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/6c86259484f9281085a9801721b09d9a/luwasez.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012786.bin
09d5d745f275caf3c05f340a1f101469eb864c2681ab42034f1431c369dc679c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12786 10288 bytes
font_01_sfnt_off00013e9d.bin
b35ec92eaf04c84515c793f0318ac5f22b49fbdff145c2b87bf752a3a162e697
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9D 17936 bytes
font_02_sfnt_off00016e3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E3A 16792 bytes