Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c74270cb6d3cdf7…

MALICIOUS

PDF

89.1 KB Created: 2021-07-16 21:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4af866de960a87e05a89680941f3ce50 SHA-1: d4ec2a831cd13e7205aaa25c4cf398c2a350b9ff SHA-256: 6c74270cb6d3cdf7c434f4274e0007609ac8638dc2bf2ecb53895f3d79a2f138
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely serving as a lure to download further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/18577820bdd6ab1186fcb3b5ed048bd8/73414549673.pdf In PDF document text
    • http://t-p-fortune.com/userfiles/file/tofalobised.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/alpns7c8s057ss516v72iikfnh/vitovuwowurapigipafom.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/76946dbf27daf2822e3f249df80599ff/bizaragasum.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/koxur.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/10b0574c537c6fd811796291b25335e8/wonajukowojitibo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/79b89b6d9548afdc7fb8110255a68a9b/jutanufe.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/zeziwubonuxudowovosipi.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/82093911514.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5be0b8173b7e77d6ff4882e35ea68da4/22364824761.pdfIn PDF document text
    • https://btegypt.comfile/82105368622.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/sutoxivaretuwifub.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/36a3bab54143a57c7d5047d947f6b6c1/posipatipapotik.pdfIn PDF document text
    • http://tfwdynasty.com/clients/f/fc/fc55782506b94f933057639757072b2a/File/24433108896.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c71d8784c7f---4073063655.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/61b3d428eb95d63d8f06d0bb68dbae25/88948072624.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/resit.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/sosimusa.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/javafuzomuzudadufevemofu.pdfIn PDF document text
    • http://zuche0551.com/upload/file/5979320980.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/10031064844.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/lelevevuvadupadufav.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/41687188720.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/lisixebonenur.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/1631496879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=last+names+with+apostrophes+in+themPDF 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_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 18208 bytes
SHA-256: 5eb6c2a4dc12570c1bb78bca6a1e2a625bffe4160fc0baeb54187149c001c972
font_01_sfnt_off000126dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF3 10512 bytes
SHA-256: 5719c700171e1c0906f1809be1008e84664b8afbe2892b17c7c94aa289cf03e1