Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbfa30926657532…

MALICIOUS

PDF

72.0 KB Created: 2021-08-31 19:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 72db55ab0880268cb8d94f77fdef106d SHA-1: 2f2804ba5db575fc9d1a83c13ed5a420c3480da8 SHA-256: 6bbfa3092665753279a6dc87e40486d1daee26bb762aeb87069bb3d42ab73dd1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating phishing and trojan behavior. The embedded URLs and link farm heuristics suggest the document's primary purpose is to redirect users to potentially compromised websites, likely for phishing or malware distribution. The authoring application 'wkhtmltopdf' is not inherently malicious but can be used to generate documents for various purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=430+kw+to+hp PDF link annotation
    • https://vestol.bg/files/file/sajiwus.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bakozukomerekizemore.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/zakibiwegek.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/sudepegebafamukofimame.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/newojaxigunitumewuxitib.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/33597634735.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/91609352244.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073c5cb1187d---28709755413.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/pemomuvefaloxejetomexi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/952129791a72ba34ccfdc70030c9ce06/67808011386.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/zasotetos.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ear7tlht70ec9mf0g59pak3nt6/xuwalinuvamiwufug.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/gagutaxaresadekenodug.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021073118111668.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/tekagejekelidirid.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/a13162c4b704ed7c82f4300e62cf7ec3/67552319765.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/74974234689.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/tugaginenavelebo.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/82822554906.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/90339196266.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/wuzexizizegusarenotoxez.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/38069355343.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/db5dc6b66c06adebcad0d8bb9eabd8d5/mekudawalovoso.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160943c7dd15c1---miwepumaduzodakoxupas.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2f7dabb90---62016241565.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_off0000bd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD593 9996 bytes
SHA-256: 94ab23ceff4dc8acc6dca7a7649a793b09374adb9b7b87622d2d7e2e609b2663
font_02_sfnt_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 15384 bytes
SHA-256: 2c91b57f7d6217430c7145ab3d8222b0d37bbf9bb32dc8eb509992587990adfb