Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f25c3bfee961fe0…

MALICIOUS

PDF

72.4 KB Created: 2021-09-09 10:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6fea70501c491200b9c805fdb0c7b62c SHA-1: f387f18d3b2b6f11ec5374c87aa80a3d4bebfb02 SHA-256: 3f25c3bfee961fe0163b7cfc9ed2f5fd829ff09216131e654808fc83e28c7354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to distribute malicious content, likely a phishing lure or malware downloader. The ClamAV detection and ML classifier strongly indicate malicious intent, with the URLs serving as the primary mechanism for delivering further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b6aac0e6---58198011757.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/lp8sddkdj5ij5pnljuqvt14rr2/46175234938.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/riwowabobifuk.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/16426185764.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/iijkot8fmch98ldnp8ohvra032/nukiletozemejisofawoxov.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/wulusanogaj.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/vobosekaxiforobox.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/770067445.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/lunesusozofiwajuperux.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/98149963956.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/47777482087.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/xewojewusisiwopa.pdfIn PDF document text
    • http://df-2.de/images/daten/file/39837484413.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/83673727525.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/98f666026a9a42cd3575c11552090d20/80173733636.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/xevonisemen.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f896a1b73d---kiraxuzobep.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/127153947161317ebb728cc.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374929b199f---57835833745.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/bofejegozoxujola.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/71418640186.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134a9629ca53---jires.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=live+mobile+location+tracker+apkPDF 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_off0000b8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C9 10620 bytes
SHA-256: 8a7f538e3e601aa0a33575d0ea645b37c5c9b67c97ed841877b01794bd4517ea
font_01_sfnt_off0000d0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 17220 bytes
SHA-256: 40233c257e033cf8f71709538422ed0b8505cd37324f38a190134427b0887488

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