Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9629344dad4e588…

MALICIOUS

PDF

77.9 KB Created: 2021-09-01 17:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4d90b64ed2233e253eff06b97b24424 SHA-1: 3300451fbbba6a72abbcc79011a29ea364d8fc8e SHA-256: c9629344dad4e58870fe4769d421c53dff7cab16408a4e837d6e0e044f53e37d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/664ee170fe1310c0d4e49ca4d87f3e43/nekub.pdf In PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad49e6a2f84---dupomefijox.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/gulogut.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ff859fddd---gutaxalapefovome.pdfIn PDF document text
    • http://18554080.com/userfiles/file/rosuben.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/85hshsl3ktqhit2i3mjuh3eeoq/29184576860.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/mapitazebob.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/18295878230.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090fd8c9f94a---kilomokaloteweribesusa.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcea8bef6b---ritanerapow.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100bbc8ca135---15282777311.pdfIn PDF document text
    • http://mcutech.net/upload/2021/08/file/16285489541545471003.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/zipetesawidufopi.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/50406870562.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/44582645753.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161014178b20d9---90516739973.pdfIn PDF document text
    • https://5uempat.com/contents/files/wibusufobozixa.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/bifumonurikela.pdfIn PDF document text
    • https://actorconseil.com/files/file/duwesivapupajojebuzam.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/kimalaxitalu.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210828195827.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/83543770173.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/wudoriwitevumali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=badgers+in+the+nflPDF 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_off0000cffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFE 16784 bytes
SHA-256: 1a094fa26f01e12c98378485e899f4e1eed592c6a3b1a7571afcee842f7ebf25
font_01_sfnt_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 10564 bytes
SHA-256: f6c0c211adbbaf72d22afbae73f74d3b0ff1041ac0d77976af06bf19bd7dddaa
font_02_sfnt_off00011393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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