Malicious PDF — malware analysis report

Static analysis result for SHA-256 871a74f17f56b201…

MALICIOUS

PDF

71.5 KB Created: 2021-09-09 09:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 718420dcf1c7efb8247482bd0e8021c9 SHA-1: 02dcf303a256226ef83c01de77004b71b6be7b4c SHA-256: 871a74f17f56b201ac06dec27758c2095699ba7529f77860ead62db98e5ca34f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using compromised infrastructure for hosting malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://leebyenghun.com/new/upload/board/files/71282359629.pdf In PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea09f319d---lafafekekefokewadugibelo.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/57603577302.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/gogonovefosutugiruzone.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161333ae83a41a---367103278.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135aced52cbf---95759316322.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/4167517205.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/xakeges.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/564sj0q9rids3t07u10dmdjd86/jirita.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/4643768100.pdfIn PDF document text
    • https://trieurodata.ro/images/file/noworiruluxenunepu.pdfIn PDF document text
    • http://airfa.it/userfiles/file/ribipararomomojafi.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/45851480660.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/83741450127.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/tuvesoluzozagexifumirem.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/63077083361.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/78946710122.pdfIn PDF document text
    • http://naso10.com/userData/board/file/32209874887.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/sejoketajukog.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/14028911194.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/2894655297.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/89052965497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=aaj+tak+live+news+app+apk+downloadPDF 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_off0000b37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB95 10640 bytes
SHA-256: 8bf83b6440f3c9472f5c1e698a2b8c12894a30661a60d761cbecde13335e5f1b
font_02_sfnt_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 17236 bytes
SHA-256: d473a649bdf6ea872b5873d91790fba128353ad6503391f3f790592691ead3dd