Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7a57479f5293c5…

MALICIOUS

PDF

89.6 KB Created: 2021-08-10 14:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0205599c03941c6b7b38e7eb6beebfcd SHA-1: 10fab6a2fafede12e478dd4009bae66e58ac173b SHA-256: 6b7a57479f5293c51846928e0f993111501a77b4167ac188495d9ba1c393f174
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=riassunto+introduzione+promessi+sposi+pdf PDF link annotation
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a455f9dc14d4b0d96fbe596812f7b92b/69658002818.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/17997868561.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/281049181830.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c1c25096d---77405978938.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b9824b0eace---gewafivisokinevibeg.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c073bfec6fa---63459527978.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210807042244.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/uehsg2lno71qmdltf04k6ckot5/55111743930.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/jitizo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606f678469071---runinozowuz.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f9677701204cbbdfc72d52c9fc40b1a3/lekiz.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/4d2f0113b0b085cd0aba27da8c857d31/wepilozivukasuvuxoj.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/78854821080.pdfIn PDF document text
    • http://waltripclassof74.com/clients/8/87/875eff38522a6836d9fda94c5a2b6b26/File/70032026477.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/647f55c048ab0fdf3cdba3561cf75d43/nunixasudutimodukoxizolex.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa3eb0ed1878581675c9731034d1c1f8/61718380473.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/j0oer7vfp6dmutth426loiu98v/gajokajito.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/repigeni.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/59365710683.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4ec73e505982177fa08ebc62ab56afec/pagigawuzezotoxik.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/86750779076.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/apd0msh6ro6ir8sku35p32gmv3/nogariwiwevinupigipajod.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/rmu0u7ikevfag1qfrfjc4j7bc2/wogatex.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/wobenawujovulawutav.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_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BB 10816 bytes
SHA-256: e65c6cdfcdc6f6c075fdd82d2e1a4efab34d42364b006f25de979ec0c1200604
font_02_sfnt_off00012aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABA 17328 bytes
SHA-256: cd3fd426fef305c026bd2b843ff67ef962a72c9ffa67b2137a85b19bd74340f9

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