Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd400590950592b…

MALICIOUS

PDF

93.5 KB Created: 2021-09-19 23:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd72f015516ab7f749a549ecc664539a SHA-1: a977b91729d3473b270f4d7914453d0e5e7fcc4c SHA-256: dfd400590950592ba8ff029184c61d8e34b82f389eee60211546642ef09428e8
156 Risk Score

Malware Insights

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

The PDF contains a link farm heuristic, indicating it is designed to direct users to multiple external websites. Several URLs point to compromised CMS upload storage, suggesting a pattern of hosting malicious content on legitimate but compromised sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://dayou.tw/uploadpic/files/202109152047494080.pdf In PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f99ff927b8---kepudevadoniwazuwopisawo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614524580ad24---16191897325.pdfIn PDF document text
    • http://vinmexindia.com/uploads/wifimafalatuwex.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614612598af58---50102187088.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331d9fd5b78---23731566015.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/27337710462.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/gezozifirezijonutewefarit.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/dufota.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/surawuwekulawuwerisaw.pdfIn PDF document text
    • http://henca.com/files/details/file/ladodofifuxopiluki.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/48750628384.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/kizegudolebepobeso.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/45815263629.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613add091be7b---supidekajufexuxaxeler.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/63248596139.pdfIn PDF document text
    • http://lejonhund.com/upload/vegikopefusibe.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/tobiluxizisefudaxu.pdfIn PDF document text
    • https://scmsgroup.org/ckfinder/userfiles/files/34892970156.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/nurulezamoguk.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/41275788976.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/89419939277.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/bujukemirumav.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/risolafefax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=among+us+2+play+online+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_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 10920 bytes
SHA-256: f4f30b13f22f8c48da5a00cea285bb25306807eccaba0d254f19cc0d3d0ab47f
font_01_sfnt_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001372a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372A 18828 bytes
SHA-256: df569c56263e9b9a803d5a2c9d6e0a0da3d2c4ebbbac7e71b988c0bdcde25767

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