Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c80958f9c5fe199…

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 17:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00605e158baeca4bb75b7b628c3dba2e SHA-1: 6de9b606d28479f011049308769344805ba01655 SHA-256: 8c80958f9c5fe1995fa619895ec783a0ec160213b1123bdd4e83c172e47c82b0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URIs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=equivalent+meaning+in+english
    • http://maimungkorn.com/UserFiles/file/mimavajorewojo.pdf
    • http://bassbasement.org/userfiles/file/72820781992.pdf
    • http://eaas-journal.org/survey/userfiles/files/30272138558.pdf
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/duwodotanodadora.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/xezubesuvevi.pdf
    • http://moscreen.in/cmsfiles/file/luposabog.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/76149505017.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb66d71bfab---felemedavorunevorada.pdf
    • http://ambvetesopo.eu/userfiles/files/zasorelizofadizo.pdf
    • http://short-story.ru/upload/file/dagasorili.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6ed0d559b741c0655f802213b89e3fb7/85585543587.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/09193bc30f626d0e1e6b85226187d147/zoxudazitefixamalop.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160af920d7991b---63525005972.pdf
    • https://otoform.com/upload/ckfinder/files/nunoferune.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/38234388403.pdf
    • http://promocode.lu/userfiles/files/mipoxibigu.pdf
    • https://haidangpc.com/contents/files/dabepuwireli.pdf
    • http://hoaisonland.vn/upload/files/87867567338.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b167bb5f3b5---98143080357.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/stj7ev73edu9dhmrp1d8gnu1h5/16851408230.pdf
    • http://kiemtoanhaiphong.vn/upload/files/54239606372.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c0846fd2f0da9fd47f2da13344129f19/97225288654.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160882e2354d81---jolerefinideso.pdf
    • http://okwmd.com/upload/fckeditor/file/84488441815.pdf
    • http://azbuka-d.ru/ckfinder/userfiles/files/kojomipetul.pdf
    • http://perfecturology.cafe24.com/upload/editor/imagefile/torezopojadaliraxugom.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c21c.bin
c083a14f5689a11b284b63644f08982d4bd489166183d7e2369d1c260c889e97
pdf-font-stream PDF embedded font (sfnt) at offset 0xC21C 10632 bytes
font_01_sfnt_off0000d9e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 16792 bytes
font_02_sfnt_off0000f1fa.bin
16ee7215c5d5e0d72e1a8ed4bb3ac83080409df2240675a5f71fdc39d501acf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 16564 bytes