Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95b4404d9e78635…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 16:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fabed34659fdb18275094a49378dbaf6 SHA-1: 1a95324925ffa5809c9e0dcebc4e8367a74aaceb SHA-256: c95b4404d9e78635dd202b3cdc1e47d4f0d5f8036f6110a6180752035929e5b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics point to the document functioning as a link farm, directing users to various domains, some of which are hosted on compromised CMS uploads. The embedded URLs suggest an attempt to drive traffic to potentially malicious or phishing-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://divodizain.ru/ckfinder/userfiles/files/gerujar.pdf In PDF document text
    • http://redskap.ru/userfiles/file/83196395233.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/20731362706.pdfIn PDF document text
    • https://okazionche.com/files/dilubutobitonadoxerefi.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/kerowatoxamureviti.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/febiwogozowenufod.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614014001368e---rebefekufokidisun.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/76658527193.pdfIn PDF document text
    • http://vpsystem.com/files/fck/67635090352.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613549a91c8c9---57064316143.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/jirivebojizajazovezu.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/85170368264.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/tojitofugamonalogo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/85dc7e84abe1109cdba27cc4549aa246/rusuxotixosuxokugiligikib.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/nazupatiso.pdfIn PDF document text
    • http://checopharma.com/upload/files/xexaj.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/95278303638.pdfIn PDF document text
    • http://agama-rc.com/upload/files/selasiponowuletu.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/34465682861.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/psr82obr3vh3gggrun198hml2b/negadojin.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/99397486533.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/11525239045.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/zurotodogasigabebox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ghost+rider+game+mod+apkPDF 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_off0000d150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD150 10820 bytes
SHA-256: 9d01fe442b150403762df19b258456d75c2c66cfc82dd73dec617e3b13698ddf
font_01_sfnt_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 18472 bytes
SHA-256: ccfa965bda7b9f67a5f76fa5e5683eadfc42cb0e0c6714a5c2cc983f69b64f73