Malicious PDF — malware analysis report

Static analysis result for SHA-256 959f9024e3a3a552…

MALICIOUS

PDF

74.5 KB Created: 2021-09-07 06:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a87b9abe4ddb1b0790006979671e910 SHA-1: c1e7b37039fb21cd0b2e013e1cc06042e9f05481 SHA-256: 959f9024e3a3a552d7955420c8d75ed54fd4f7186ba3c5e2c06d5406d46b0b7e
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress installations and disposable hosting. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern observed is the use of a link farm to redirect users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b83ca9abbdf---retegisibopezekubugamet.pdf In PDF document text
    • https://georeno.ca/userfiles/files/59804470524.pdfIn PDF document text
    • https://okazionche.com/files/naduvapijudarelokodo.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/lcrtj5mncqbv54iar3d28m49gc/72063932596.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/145dc1a9383d634c4d542cebd67e0754/97411325389.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610b0ffcef1b9---komowukakaxi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a2e3effc---mimakemelogotenegikopota.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/rilenoxusa.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/27410218238.pdfIn PDF document text
    • https://mcdpiti.com/userfiles/files/ziniwokodof.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5d0405502---4079471966.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/korexumujepapuvenixuz.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/susujumasijure.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f28fa861a3---62436003962.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/laxafidogabizuf.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f931bf1d41e7a4c76e5e6f7916964d69/rusuvinozimapaku.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/76635414044.pdfIn PDF document text
    • http://ihdbd.org/upload/files/jojagerupavaramefune.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/60551273357.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9f681ae6---zoxexedirogepogila.pdfIn PDF document text
    • http://markone-tools.com/upload/files/86214349321.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1594ae24c07c53c9693fa85e40f6d177/2782250876.pdfIn PDF document text
    • http://stonebreaker.at/fawajajaxudebifikijatatog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=7+times+tables+worksheets+freePDF link annotation
    • 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_off0000bbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 10644 bytes
SHA-256: abe993367d831da57c1b16124aefa25c53fa8c9f1905bdcfa5f576ae3f3ada39
font_02_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 18852 bytes
SHA-256: 6571c9c0c09eea04bbcd4c9425aeced1ae2e0394aa4f096ee3928b1467d90ea9