Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f91ca5f5d375f6…

MALICIOUS

PDF

74.7 KB Created: 2021-08-31 02:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec948de997eaf8cf0348d0ae824e59f7 SHA-1: 768eea2d9bab94583c7a9d6612e7db6d92a629f7 SHA-256: a6f91ca5f5d375f617eb706d1fbb6de4015c6bd36f5d91f0898f239235c39b54
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised Content Management System (CMS) upload directories. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=meaning+of+ordained+in+the+bible PDF link annotation
    • http://charolais-hessen.de/write/userfiles/file/23006644889.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f27b9a4065d7e834654bfd4a4a38b936/sogutes.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/84308960562.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/99841605943.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021053101361236.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bef5a017dc1---weforitopupalototifo.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ef5f071f6183c37a4a34d68ca08e7873/lirib.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/pibowudo.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9fb0338d2---lujupugave.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/13kntgj891h7hlf20k563b0pr5/53230089335.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d7c55658f---masusekurajugimi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/840396053dab56cded3f46e9d57a3a1d/50320473054.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/36521964413.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/1857583806.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2770ffa34c3b847f841b3f1dc3fb7e3d/vojuriguwekuselagozifadu.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/13758027928.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/petuziwitaridetafif.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d636d2677ba---putuvinalo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ce3e9e0d9---67106840017.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/kdn2qq7n6ndk84kvil6asm5e63/guwakukup.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/xurusaviraro.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/togogel.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/pajotenasurolux.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/1473934879.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_off0000c227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 16572 bytes
SHA-256: a316c973b8079f3d702c663c2f398ad07b9ecbb72a8c3aa5003f376d89a7e2f3
font_02_sfnt_off000104b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B8 10600 bytes
SHA-256: 765216197b71044a908d7eea7be2031a03ee510af602a4584db89d44584f5c97