Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff580bcc83ca43f…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 12:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 119924ac96e5334240e83d61c3817e83 SHA-1: 870dc171f298e4a1bcd370b67072a56150dd5cfe SHA-256: 0ff580bcc83ca43f3365beea60fcb573eeac74f9793a90d9d6a3d7a182db6ba7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=ramarjuna+kannada+movie+online PDF link annotation
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d028953e20---supogosotad.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/82176705078.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210906202352.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/4hn9liio21voufc7bh2ob52km2/muveguji.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/26246897703.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/vefogaxexek.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/goxajepixuwi.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/49526944152.pdfIn PDF document text
    • http://goref.ru/files/file/zowobudomazizumozunifovem.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/66914730437.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/71661103589.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/10038066718.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210904085419.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/jesabivizetixilejaru.pdfIn PDF document text
    • https://renewone.de/files/40508651481.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wipodowadoz.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/fobilatezigadadigefopugu.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/tuxivij.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/8742006741.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/96640029206.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c4b6b2ae2---80832219738.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/18564145429.pdfIn PDF document text
    • http://shamayachts.com/upload/file/32462587589.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_off0000d423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD423 17272 bytes
SHA-256: 5e75be7e994dcb9582bbc7be5756ea1e1499d3a3c44a1e912a47bf089926e0ab
font_01_sfnt_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 10576 bytes
SHA-256: 046d8d7bbf5be94bdd878a237999a743762b8b35dea91869ed2c21228cfff294
font_02_sfnt_off00011850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1