Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbcbbc6e7ada78d…

MALICIOUS

PDF

72.6 KB Created: 2021-09-02 18:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2d1557bdfba35c447c3c24daf693862 SHA-1: 5bbb6324cca6f50d31eb5d7b14102ce72f9d2fc2 SHA-256: 9bbcbbc6e7ada78d5ae85c9a9162fe92ae319a5d44d86d04d37ec0ef48ef60eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristic strongly indicate this PDF is malicious. It functions as a link farm, with numerous URLs pointing to external sites, many of which are hosted on compromised or disposable domains. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, suggests potential for further malicious actions like downloading additional payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/h9rv9alna14965k9dgb9gjr21b/sitawukopedugi.pdf In PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c30e042ba138ec7e61fa6187403f7aa9/xumisajisiwabaf.pdfIn PDF document text
    • https://ptogel2.com/contents//files/vilozikasive.pdfIn PDF document text
    • http://dalaichau.com/files/wexukipufabugaroja.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/panabasiduke.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/dodoloxopugesevov.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/eec50b23b6690da40af3d5d1a1d80aa9/zajugavufavubok.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/mifig.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/4nui4l1h67jn2us24d7pd0ipkr/patatugajevuvifuvan.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/16b1fb666b4fe08ca10118f3a5a7d034/sesukubejepijubudog.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/81c2db17f081dfc646e4bd5222df7048/xusevudixezofigu.pdfIn PDF document text
    • https://ladymamashop.com/uploads//files/202108120626558066.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/tusizorizugo.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1eef8ca85---variletunebabux.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87ab8828b---75709995222.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/eda5416551355417b721c45676be8bb6/11270982091.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/5bbbb5def18a014a939040e4273e7621/69467288738.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/73118199153.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6e407c93---gazuraleradepivovofe.pdfIn PDF document text
    • http://dhf-china.com/d/files/36285349645.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/pmrh07vsgdnqeing4imuos2qqp/54559906355.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7103aad5a2---pisovejemotavaxipeder.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/97345784832.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/fatesetuxobugovozob.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/bed053e6d1e1296d3708486b8d92ac73/99496247103.pdfIn PDF document text
    • http://strap.sk/uploads/file/99626788006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=differentiation+and+integration+of+power+series+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_off0000bab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB5 15956 bytes
SHA-256: 72fb07d38b59316e74616f73ae51ba0e6216df9b496cf0e5fb4f2157d0646bc0
font_01_sfnt_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 10716 bytes
SHA-256: a394c74fbaccf45b7733cb0168df758bb01f6a680d663fa61d94639148852251
font_02_sfnt_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1