Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf695d4f75d0801…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 03:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6211bf6a0bfd62127bd0a21c33fbfefc SHA-1: 484c999c7a4222c66f798eb0697cad622f7bb0d3 SHA-256: 6cf695d4f75d08015719a07e8a28157f94b53259f43d80fe21959041d96d7a7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF, as indicated by ClamAV detection and ML classification. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs points towards a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=traffic+rider+hack+apk+ios PDF link annotation
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161384165afa87---82948670500.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613be04a598d1---48766641974.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/16000095779.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cfb4e2b36---89301782241.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/18241079505.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/tetonazituxatun.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/pinewibozosivimo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcf9177adb---rujefe.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/nujezaxikexuz.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/vipumixigivalosage.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/60683645068.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1eedcc9a7---42295214572.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/79378798129.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/29978909686.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/22976376092.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/nisesexuvejejofebonejo.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/detewusabaruwutuvura.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ab5a52045fe3f428e5f02aaed0c4e62a/zibipo.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/953707787.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/nilotedadij.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/95601769283.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/razomepike.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/1365033042.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613694a709b0a---donolorubamububulonezo.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/pi4v5bfcl1algc2o0e3k25d6p3/luvopowu.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/wimukaretipam.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_off0000df14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 10524 bytes
SHA-256: 2499d16ad301a323d22f1442eb0ac43f085be7dcebe8778a3cd2a5e151111d46
font_01_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 17144 bytes
SHA-256: e307c05a54bfedba18459f3c3deaf9108183a2f6df280259d186e3647af79237

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