Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc49e20427084cfe…

MALICIOUS

PDF

90.0 KB Created: 2021-09-17 18:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed3e43a281d466585c49a14c645fb09d SHA-1: d64f01fd3dc63e224a1fd726affece6b48ad7adf SHA-256: bc49e20427084cfe8a7e5b094312ee34cdc8ef1d9f1d01fd1d240fe0e9202aea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, 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. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards exploitation of user interaction to navigate to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://lezeckastenakosice.sk/upload/files/94514366818.pdf In PDF document text
    • https://ms2oke.com/contents/files/27673598303.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1a0ad503---mofimexurisusasil.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308ab765e96---20133277051.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/sagugezam.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/vuxivo.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210913161031.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb42ead2f---ronasezogevi.pdfIn PDF document text
    • http://erdbau-rauch.at/gibirikes.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab03b4b31---dakojekujetodominerelex.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/xewofojorigolexawupokok.pdfIn PDF document text
    • http://getvisa.ru/images/File/fokinujenugonulixirap.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/67420124831.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/83880372248.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/tepebezosidasanofinixoxen.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/35961747952.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/94188277982.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a845fa8f03---64302977766.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/togirarabasavosubepozaf.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/wagoxumulebifojojuxavis.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/90818189906.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/deduvotu.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/lamawabegokawuvubisegegi.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffc307dc8c---24486630948.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cdf7014fe---85809134474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=music+track+maker+for+androidPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/bexitomapadezileke.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_off0000fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 10776 bytes
SHA-256: 88ac6a935cd986070935ff8d1cbfefa45e5aa69417d0b06e444ae371f9261ad8
font_01_sfnt_off00011512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11512 17628 bytes
SHA-256: aeb6879ebd134ea1d8d3c0db051d4b1813fe2f1f58a2fcef2b247fae49dd1303
font_02_sfnt_off0001428e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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