Malicious PDF — malware analysis report

Static analysis result for SHA-256 212278b1bdfcb82e…

MALICIOUS

PDF

75.6 KB Created: 2021-09-05 16:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1e25ea539b4d824515624cd31d94c47 SHA-1: 16e0c96ea31b02efd6f4aad3b138d4a65c6e100f SHA-256: 212278b1bdfcb82eaed8a312316869406084c950f4711cf0cb7ee309e2263758
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many external URIs pointing to potentially compromised CMS upload storage and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://enjoyisagenix.com/ckfinder/userfiles/files/98622537069.pdf In PDF document text
    • http://www.urbanwaterways.info/files/79083826207.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/50666312562.pdfIn PDF document text
    • http://kasargod.net/uploads/file/solemav.pdfIn PDF document text
    • https://go2germany.ru/files/file/kokevuro.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/pogezarapibafidopakupe.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/zasemalipewobas.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/javite.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/jurilulumakipodaxexajov.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/24756851462.pdfIn PDF document text
    • http://shosholoza.de/file/93384032690.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1cce5732---vuwarisuxezamoxir.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/41341828279.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098b05ca5212---59833966539.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/99902042924.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/64241613668.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/91343067472.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/15bko1dtg5jg9m1sft82r79c81/96585081458.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/2174096520.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f187f9f5941b0f85fa4046d6e4589f87/86586438999.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/9524bd3fd5b5726b6b540fdd62442fc6/numixuxipowugamewuwa.pdfIn PDF document text
    • http://thaide.org/userfiles/file/pozonutikexek.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aef7e4760---70387911077.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985806a322d---goxowagamiki.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d79d0f0ee---43501937457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hamilton+beach+stand+mixer+manualPDF 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_off0000c1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D9 17676 bytes
SHA-256: 48a2a873b54b050e6f33bcc2481687a4580590faa91c436b574c54c5af234cb7
font_01_sfnt_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 10968 bytes
SHA-256: 2cc4347c5ec900bb2476f60f1730e935a137093d9c223d028ecc01c12cba1f94
font_02_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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