Malicious PDF — malware analysis report

Static analysis result for SHA-256 2312d971f5487d91…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 08:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c6bd67b821f26a963accec7fa6f22997 SHA-1: fedd50b63468d4ba5945c67f6053e1d3ee515bec SHA-256: 2312d971f5487d910a4037c9caa612c04da7aba484403f566837791f10d10e10
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs supports the conclusion that this document is intended to lead users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=shakti+17+may+2021+full+episode PDF link annotation
    • https://inverpalmas.com/aym_image/files/17501799643.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/93664407299.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/letapiguxukelamiga.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/desolidorum.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/75831814282.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/vijekev.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/eb50db3f738b22c38e4fbeab9160dca0/98000596344.pdfIn PDF document text
    • https://congchung7.com/upload/file/varolakaketutebanubod.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7731165ca---13193234779.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/vopasadixojotege.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/92202157053.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/toratexivomeviravisewa.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/2kkb90l21pepaqqncmfpdfjdd3/73257523782.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/87684117373.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/gotomixod.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gexowekorosezonofiv.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/33930942679.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/e5081535d069a8f89943bd0722b346c1/zolugebebi.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/1759079327.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/3758185403.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/totamezebuwis.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a6837de6---89448755966.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/taboxuxufuzuritire.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/wiluxozadebeme.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/46587985085.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_off0000b624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB624 15044 bytes
SHA-256: 1b13db8dbdf26a0359e76ede57626f6726e3360a7f281e2e340d84a71fac7397
font_01_sfnt_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 11284 bytes
SHA-256: 7ea65320ef2df028d0d7fce92433877ffe5282ad0d7303c97948e17752aa61a7