Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d7545611259c97…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 15:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f4882341267ce569426683c7f935132 SHA-1: 5125e896ec528f8fa862685d57ff2e7ba85b6d12 SHA-256: 31d7545611259c977105b46506f28aff230a3a8f640e2ef6920da00a9ffd45b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwebjor.ru/uplcv?utm_term=bee+html+email PDF link annotation
    • https://arnetbilgisayar.com/upload/ckfinder/files/45848894319.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/jomoborubi.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/wokaxedap.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/70486486202.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e85d8dd8---rojepapuma.pdfIn PDF document text
    • https://chineseclothingonline.com/File/fuxorasitokot.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/82980197781.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/24765987592.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/10331664012.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7bb5a5cf---41868486412.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/mopozigaxugo.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/nebupirosozu.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/popofenuguxolas.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/wezuke.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef9cde611d---ludidufipani.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/55188681885.pdfIn PDF document text
    • http://glttek.com/userfiles/file/70054470965.pdfIn PDF document text
    • https://papiratisk.cz/soubory/10347972094.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/5924010581.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/nugupinixukitegeno.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/94803282711.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/10754252590.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/mogilidozosu.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/dovofudeweru.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/tilixeredit.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/34014976430.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_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 9936 bytes
SHA-256: 2ce1af86037bdc8a051219a87205d1272a400fd24f600ec3b35c52e5566deffc
font_01_sfnt_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 18048 bytes
SHA-256: 69086209f8d376a2ddc7fd39e8758239cdfc29808b6261d1bb27febc99b9d9c9
font_02_sfnt_off000118c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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