Malicious PDF — malware analysis report

Static analysis result for SHA-256 8797d81af385748c…

MALICIOUS

PDF

86.3 KB Created: 2021-09-21 21:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: beb0c4c8107b2933ae73de5115d93191 SHA-1: 8843a8bf25cac19b43cee87707bcc443b0f62c26 SHA-256: 8797d81af385748c95e524e3e5a2b82039135b0d4a0862960c134b4980ed58fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggest a link farm designed for SEO manipulation to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147e0ffdcaf8---buvabokepexituvuladekul.pdf In PDF document text
    • http://apsara.ru/userfiles/file/4700454370.pdfIn PDF document text
    • https://blogsma.com/files/74769090170.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495f0407f38---89693666047.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109191010201649.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/sanapik.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/98773554973.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/nugofarabosupibelorux.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/89097573077.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/51006143173.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/tukelanirotuzatok.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/74934213958.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/sufivujusazos.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/pipenizaribusomujis.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/8106095692.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/58366649965.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/76303149179.pdfIn PDF document text
    • http://domainecomps.com/documents/files/fasakopoligetujagunomuda.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109120227502744.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/14405546088.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/parodazupog.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/libuzasazusopixote.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/powisiderolij.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131716277cee---remojasobipubepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=apple+id+activation+lock+removal+toolPDF 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_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 10644 bytes
SHA-256: abafe275e943fa0d3e79a2c223b079a8552ea7f72684631d77bfd89c34c6175e
font_01_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 17820 bytes
SHA-256: e2c7f9fb145b76bf137ef4c2d3f8f8ff7626efaec68b93821635839eec49661a
font_02_sfnt_off00013311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.