Malicious PDF — malware analysis report

Static analysis result for SHA-256 273029b0b6fcb159…

MALICIOUS

PDF

168.8 KB Created: 2021-08-14 15:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d2fc8390775da6a61505ec655957cc2 SHA-1: b76d54aabfdf1f2e34eeb2906877b47f44d1da01 SHA-256: 273029b0b6fcb159bca2aaeaa8346c76f3d8657bc0272d9db05e4d9f1720b99a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress upload storage and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable binary data, suggesting it's not intended for human consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acee4a03987---22533232858.pdf In PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/zavonepukuzefazuvek.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/3asojts9qim4t8n0vggmsjjl7d/57301664718.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c637b70d113---5018852976.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/46160885437.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/58819551294.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/fokasulosezaxu.pdfIn PDF document text
    • https://12shio2.com/contents//files/85687042190.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4afc29f25---37097622756.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/63566079131.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2d6611f3db615d1c5fa730922d3e02cf/36411448351.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/kimexalatimufuki.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7db9a5adb4---1254633662.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/67463738564.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/pibawo.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/4767285290.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/q00a8l147985lvqgql8pisi234/warosomunukumosal.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0987ad8a54ad630c7094cef91d5e6bc5/vezilibadinadugiwuf.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/wamodifugu.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/64986047871.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4803378364a667763221b0fbe2f7ab26/bagajapof.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160866e880a026---jawidimelab.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/98697428008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=factoring+perfect+square+trinomials+worksheet+with+answers+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_off0002339a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2339A 11468 bytes
SHA-256: 534d456ccbc91c5dec198ed2cad438446a184cd30dc3fb459001716c13663d7a
font_01_sfnt_off00024e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24E16 17248 bytes
SHA-256: e57bd38df7edefb16f5feb968958c19e70145244c57433dfac152a861ad91ff0
font_02_sfnt_off00027b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27B74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1