Malicious PDF — malware analysis report

Static analysis result for SHA-256 884d28857ed716a4…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 05:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8328750329e839469c198375d8c00b4c SHA-1: c20ea980fe7a9c33bd1e81a130c6a48b9bd6121d SHA-256: 884d28857ed716a420d9d23e686114a24fbf691e034c59096ef8ea738f3a9524
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://mlmrockstars.com/ckfinder/userfiles/files/botigi.pdf In PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/34987800542.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afdf783046---77247987508.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9904a66cd1ab17a3575ec164807bc81a/lipuroniwinutidizoxililel.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/raxapivugibinovazabut.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/k3r6ugt9fv6vmn6l2p7js34sou/belubinomo.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/11052879771.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/4q60aqagrf0m75gbdsl5hf2q94/veroxajoleregekamurorukib.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7514ba62b6d0584b5c9479079d238d0b/texexosexi.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/19768036864.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/tugobewuji.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eee41cecd---74761818018.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/27399044026.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f704ec0806---zixoravuvimazotowosoxu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160abcbf2ba1a8---81814079851.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610037da9c265---fuwumi.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/56028854286.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/dukoxoveposesiferi.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/bukukozokinabufilugegoji.pdfIn PDF document text
    • https://alutat.com/data/file/bulefox.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/lijivumafe.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/zunumisapumadi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16087b86384594---xuturavefemuxiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=worksheet+on+finite+and+nonfinite+verbsPDF 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_off0000cd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 16556 bytes
SHA-256: e5de7d8f1ea8da173db1509594259b3f6624f431865e1d3c46bff53de1fa9741
font_02_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 10696 bytes
SHA-256: 396461197aaa8b6deb2f4ceaf8184db3ea30c40167124395e52d9a4c8f3e3633