Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba17064919b0fcc4…

MALICIOUS

PDF

72.8 KB Created: 2021-09-12 18:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7449b43a6d9ba550fe282ab229a5b23 SHA-1: bb3164b90dd087e15da309c6e8cec8218d5d49ef SHA-256: ba17064919b0fcc4467da12c13b2551cdc3061bfc8764e02fc1bdb928d2a7eef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the 'link farm' heuristic suggest the document's purpose is to redirect users to malicious content.

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 https://synerhu.ru/uplcv?utm_term=megamind+watch+now+free
    • https://kltccompany.com/ckfinder/userfiles/files/muvasamugilumukazusaj.pdf
    • http://drironcat.com/images/file/kazutopawoguvedufex.pdf
    • https://rajatotogroup3.com/contents/files/menugawimesezola.pdf
    • http://alexdisinfestazioni.com/userfiles/files/92658470711.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/51936280500.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130749757056---dutumuda.pdf
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/tijujaraxuta.pdf
    • https://guijek.com/userfiles/file/xutevofipanalirosimowipo.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/9465604036.pdf
    • http://studiosiciliani.eu/userfiles/files/xulebijusela.pdf
    • http://smartwealthhk.com/userfiles/mavejo.pdf
    • http://muszempilla.com/files/file/turefozotuv.pdf
    • https://delta-relay.be/userfiles/file/69886713183.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394459c783a---kawebazo.pdf
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/fejowax.pdf
    • http://intertravel.hu/_user/file/nogesezinudepelir.pdf
    • http://kdwatch.net/upload/files/2021090121581598.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/b4c019c1f16abd7a12d979ecc3ca52a2/nepetevi.pdf
    • https://olterus.org/contents/files/lenumelozaseluwur.pdf
    • http://fsgpj.com/upfolder/e/files/20210904231324.pdf
    • http://meetburgerusa.com/uploads/files/zojezikew.pdf
    • http://digitalpolicycouncil.org/imagenes/file/bafisa.pdf
    • https://sieuthigo.vn/upload/ck/files/54159525187.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/2489910529.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9c4.bin
af9e2c1c7034cf3d961b931bcf34d946dfa4fde52ff1924d1146f8474fdde3c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C4 10788 bytes
font_01_sfnt_off0000d241.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD241 16792 bytes
font_02_sfnt_off0000ea53.bin
51fef72ffc830ca85be575c2f0aa9b9795bc6bf279ccb39747e293f9e7b5ca54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 16720 bytes

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