Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d917117b2c18e31…

MALICIOUS

PDF

95.4 KB Created: 2021-09-06 11:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d6f5d80b034d3c33751a8ca392e65d0b SHA-1: f5ac1d2e340eff263bfc0907d58f7f6cfa25e3eb SHA-256: 3d917117b2c18e3148e0ceceff2d236306bd35cfe44416795500d36e7b60ba89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=apocrifos+del+antiguo+testamento+diez+macho+pdf PDF link annotation
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947dbd0f0ba---wusoxokusujivelomuw.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/91571362225.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/34060607534.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/48945235787.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cf4ad0ab8---25068767523.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e30aecc89cb77463721415f52789387c/pobezikoxomama.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f48044a9311---bexopatowenufero.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/pizoxuxaxupanufosixijiwi.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/32349530797.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796bd39d54f---potudezumad.pdfIn PDF document text
    • http://trinkhorn.org/userfiles/90713008060.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/26569298794.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/zezubijukevitale.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/64049841962.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/mamedemagumugibof.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a17cb7d4688dad04bca08fe32fe06710/79905717260.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/karokemom.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/kazewubutum.pdfIn PDF document text
    • http://computerdoki.hu/user/file/kufijukixesekukisusudaf.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/66147553170.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/totevepeworuwit.pdfIn PDF document text
    • https://sharenkon.com/files/62798010660.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5a3dba084ae0772def203ac2307b52d4/mekerazete.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/mugubimekusibusemezegu.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_off000106e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 21536 bytes
SHA-256: b836ab28ef7f0db86cf6453e49f2a7abf200207aa61af4a6e580adeef6a71c3d
font_01_sfnt_off00013ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F4 11208 bytes
SHA-256: b04ebbcdf9622f889cc8edbc639c1fb8a93c071fae5406ad1fbf9a12b73330be

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