Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcaea5558370d14…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 13:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9801c860f09e148dae28c362479b6519 SHA-1: d79fa884e2f4e640f22ebdb660aaba2fb3e497f8 SHA-256: ffcaea5558370d148a0049a06a14fd1f0873c138f23bb9be25052b5302f6cc17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to compromised CMS upload storage or disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=fast+and+furious+9+full+movie PDF link annotation
    • https://dialogueinpraxis.net/files/docs/93491219853.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8453afa0336ae6235b62c29599ad7bb9/73557812362.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/kexabezed.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136b46539f29---6453248235.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/dukekoruz.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/tiduwurijopetibusi.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130a49c65724---walodujewomobamopitajopuj.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/jinovumasagigumizotugo.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/tulivusejapelelekuveded.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/vurikuxegasijuju.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/bozevaned.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-17/20210917210959150897.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/zonelumogeziseva.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///40579881069.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/66202060854.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/zaboxo.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/falinuverutisopuxubon.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210923175446.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/40518998183.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/48680784378.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/49445743982.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631335580.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/75027731171.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210908_A700F48ED3BE3C09.pdfIn PDF document text
    • 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_off0000b35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB76 10828 bytes
SHA-256: 0b42f9b257ccc5a8c8ad2e79381448dc67751b6a6f6b1d0aeac99cfc865dabbf
font_02_sfnt_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 14568 bytes
SHA-256: 062b96ad60347503eb8132436cfb9b4e8dab526f30d17b0e4fa6f6aaf9088d03

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