Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b2598ae2051fb2…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 12:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7e7cf66f630e96002512ad77ea0ef813 SHA-1: db4cba98ed8fad32f7ed7730b0440b29901a2b52 SHA-256: f2b2598ae2051fb2f0caff9e84bc9d69fb81e225b86ce2e6fac9550226b3f7fb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://asirakademi.com/resimler/files/69758303498.pdf In PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16135f0f0b3e5e---24608461826.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/35630136844.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/19483313171.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/bimuxor.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16134bdf86c82c---kamaropolovuxuj.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/gutoxizupexudajakavob.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b292d8a2ce---86302649424.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613614b70c8ba---50928554356.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/mosutovukorakolute.pdfIn PDF document text
    • http://ping-property.com/user_img/files/kazogo.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/61092476105.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/bawekul.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/xamimuz.pdfIn PDF document text
    • http://kustari.net/userfiles/file/togojatupogologanamed.pdfIn PDF document text
    • http://dd-eng.com/files/files/75022482674.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef6bfe2a0a---89172497905.pdfIn PDF document text
    • https://samowar.ch/upload/file/zisiwelodo.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613638f22886a---jawis.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/48251226039.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/fagapaxogesosodudizopit.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/wopajadov.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/60697001579.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109010621439008.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210910101219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+wolf+of+wall+street+streaming+onlinePDF 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_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 18320 bytes
SHA-256: e063f5627290e40c0e14db671ec4a417263bf0d2813b9c5571acf44579e04e5e
font_01_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 10708 bytes
SHA-256: a5472b186e9b7a16917b78f2e333e0389accebf2693133d596dfa462e74dd63f
font_02_sfnt_off0001282e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1