Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6bca23b799a190…

MALICIOUS

PDF

71.2 KB Created: 2021-09-04 15:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38e7d1a33881c382c7a1072df4459a7c SHA-1: b658c0e3ed81b947a73becd1c2529db6d15eadfe SHA-256: 3f6bca23b799a190090883c54b5a75b5fe05ff1b5c8ef16221daaceed8a68442
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nbmj3b40h46dgef3seufv4lil7/xanavetuwebapa.pdf In PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/risevejikonenu.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/57687393703.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/sumekazinebujuxu.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/59890246060.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096582f477d4---nidilaguvule.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/44304039530.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd9d432710---xamulafilujuvikusopo.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/58399595297.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/jirakadudezimaxola.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/jugaloponakinozeketitabe.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6755d2835---4535930727.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/jifukutadunuxuzipab.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/peodbo51ogaep0jjnru1ie1jca/8737873956.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/59005949256.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/79126638785.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/39528229439.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee48c220dc0---65603022106.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080acf0e47af---fefofuxuwirabugowa.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/4oh6956eppmj0bc39d208lg4bl/37958824648.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/vunewotovofaladuguw.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/vimigixuritakovesozuxetut.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/fetej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=importance+of+traditional+medicine+in+africa+pdfPDF 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_off0000b894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB894 10564 bytes
SHA-256: 13475ade587489c8670aecc2aa7d1c67d1646e972e7257b1451f16a895de77ec
font_01_sfnt_off0000d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 14912 bytes
SHA-256: 483b493e5a80d5a6a22d47ddbfdbbf1c894c3d308030eff374af6c12102f9fa2

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