Malicious PDF — malware analysis report

Static analysis result for SHA-256 f752eaaa4cc47a2a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 18:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a04ec0617541a532eaddb7361a910757 SHA-1: 5850cc6b3a349ac4730e0ef3dc704c02602f9f6f SHA-256: f752eaaa4cc47a2aca902bd1fbf5852dfdca1a2258736656e83bb3a126157d5b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the intent to trick users into downloading files. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=cara+gabungin+2+video PDF link annotation
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613a021782787---98128799530.pdfIn PDF document text
    • https://equimat-cheval.fr/file/pafigo.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/dejopej.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/9108026392.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/latemuvekur.pdfIn PDF document text
    • http://rjt1.org/upload/files/tuxewejesagovugilawaseju.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/92528760483.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161323d396395b---juwidobo.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/39496600753.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/70310851713.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/wawinabiwewoluzorak.pdfIn PDF document text
    • http://dakov.hu/_user/file/pipuliridi.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/rejibozekite.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/zikubavajilawidoz.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/fulesofezuselog.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c26b3c4b5---zogidimirofiki.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dfe50d4e9b5408c9b68b5d26c1662f76/tovuvovon.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/nebizavusozatokefiwufo.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/97144207309.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/pukewovuluwasidado.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/85648496458.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/torovo.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/88238123847.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/87013570904.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_off0000e1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 16360 bytes
SHA-256: 649eba3018fc7f1b377daaa81637bb2a0fa0f44434a8e81ad9455dfb4c8b7e6b
font_02_sfnt_off00012483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 10568 bytes
SHA-256: a32dc01d5563d0bac7f553de5d0eda38ff5b04bf8c3632d095379c67047680aa