Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83b6fb205a5a0bd…

MALICIOUS

PDF

99.7 KB Created: 2021-08-30 13:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f004deb05ffe4244a2e0280fab33d9ec SHA-1: 965ab20501b65af875430111d7337c4efb85f41c SHA-256: f83b6fb205a5a0bd82cc99af34cec5bcfba3acfa88fba7f53fcbda75c396f5e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pspectr.ru/userfiles/file/lopuvuforavupepifo.pdf In PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/gakexeji.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/34535449216.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/8bb42hcmsp86t297lcadbeng4d/86543207349.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cec278b3809c01a0c72a97803c7fb273/wogur.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07906a11c4---31868554626.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a84d498500c688429350f6fe4bd664bb/jesodirivonivikajud.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/8046788602.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/29989345982.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/5771f457a78cb34cfccf47b3c0dc87b3/raligisevawo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f745e4e05---kenebiwilaguraduzovuza.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/aff5121341f3d262f26579560d2ddf7f/rimiruk.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/2467e6aaa1087bae28c8b6fe0e18e725/10377584640.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/fuvawalumipomope.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2033a24fa---ridojutitekujifasovuva.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/8120665124.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/r6tk1lkva269jonqm79574t067/40573276891.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/eeukcv890u7mgbeljr76qr9lo9/gawepilowamibewuwepu.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/79087574958.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d901181fcaccefb87c6155dfc113e9a3/76927873054.pdfIn PDF document text
    • https://basisnomor.com/contents//files/51401803986.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-3/20210603190309898585.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/829f849ee8cafd1d93309fac5acc78f4/wosofufuwu.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/sijinuduzekakapeg.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/58060338004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=8+bit+binary+to+bcd+converter+icPDF 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_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 19028 bytes
SHA-256: f4c1fd387bd1711c0eaad1de3a74334b751ec8dc2866371a57a6c3e717b0f177
font_01_sfnt_off0001500c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500C 10580 bytes
SHA-256: 0edbd7185394f1134b82b2e00e04234d6ef90d18f1f90b01f8cb36041dda1b51
font_02_sfnt_off0001685e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1685E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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