Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0ee0176aa599f1…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 17:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6cf640728f41db9117f3c18c456034ce SHA-1: 39d41705cfb143094c6bb230513bae2734e7880e SHA-256: 3f0ee0176aa599f199eaf00346552b7bff40824911b012e3556d6e28210ed2f8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the presence of numerous URLs hosted on compromised CMS uploads indicates a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa924326767---totuviz.pdf In PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b047ce5c3ba---91414736204.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/vnii6idbcfk4pod5q3jt56gp1v/lejekikemivole.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4281d88c29---ruxad.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h3b7aqt0rgk2ld8a3m6cb6fj81/lupibi.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/xogip.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/jixove.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/mitutujo.pdfIn PDF document text
    • http://tms-operation.com/upload/files/zokorunowotu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1c302e290---bejos.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16100d3b07a08e---63854732095.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/78564412770.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a04506ba---sidugidirodomivumalezig.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/6qbid611g3gtfntfj2sj3rbvi6/vukudodi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f22897ca2e---11552603681.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/35075923154.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/50363848236.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2fp6gjbij9knhm8lec7mp163m4/vexepuvulogot.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/zidivegonoverepek.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/27942214158.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/37751260719.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/psunrnrq5kiins3qg4gfc4ec95/zezawuwirawusatogebuwuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fluch+der+karibik+noten+klavier+kostenlos+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_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 21532 bytes
SHA-256: 2bc2f75d8e1861774391bd565b53bfdf27be23411358fd856b617724764862fa
font_01_sfnt_off00010c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 11092 bytes
SHA-256: fe2a8feb965ad8734fdf81c54ec9746050d058023611ea8382e3d767f6f8fea8
font_02_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1