Malicious PDF — malware analysis report

Static analysis result for SHA-256 15aefc9614a1d4e2…

MALICIOUS

PDF

74.4 KB Created: 2021-09-12 06:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bba962d2de3ce9bf78535a7ec9c4273d SHA-1: 0a36f7d2903fe66ab323a1c5ec99719fe5c9775d SHA-256: 15aefc9614a1d4e221536ce6e0b805848dc12022d287756fb0780f85ce382cf2
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malicious content. The document body is unreadable, but the heuristic firings clearly indicate a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://studiosiciliani.eu/userfiles/files/kozitaxinukukuke.pdf In PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/25526654459.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/rabatosibazipivunixazajen.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/59976830146.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gikajozekipemaju.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/63943f3672eddba6f3402f1bbf0ab8fb/fekolilubikexumogotutof.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/pupanus.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7b0bcd64ea4d8eb2010e0ebf45d1d561/87953501562.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/jidutefig.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/reburewo.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/98415239151.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/lijevokijajitudojabisos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a72ee435d---27018946637.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/94554834884.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/56898417887.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/80699169974.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8c6b26d985c681949a440f5e95a84bdf/fanoturimizokitiwu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7e4c7f02---januxisuk.pdfIn PDF document text
    • http://htwy.com/upload/file/8576236224.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613611991a1e5---40517231955.pdfIn PDF document text
    • http://viettruss.com/upload/file/werotevadegelisadu.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/47954369544.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/61689422730.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/gikubiketebowositanere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+photo+folderPDF 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_off0000c37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37F 16312 bytes
SHA-256: 8bccf93a54f694609aaf8df5b054b921793ffdc76b69070ac7b7be7f5822d80a
font_01_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 10248 bytes
SHA-256: 2ea0f3df1942560fff9d005b270c8fb0fbf622593a949282c0beaf75dc8438b5
font_02_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1