Malicious PDF — malware analysis report

Static analysis result for SHA-256 0934c50755127ee8…

MALICIOUS

PDF

93.0 KB Created: 2021-07-26 11:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76da014510c9f148e323fa32eac5447a SHA-1: 5034e9ab73c85ee5a53a4fc97994a0e00d152bd1 SHA-256: 0934c50755127ee8a4e9fc10b083981a61ef60d088c6751f54f9fe930caaf9ee
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 various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nfrostov.ru/upload/files/83307422003.pdf In PDF document text
    • http://boathousebrokerage.com/userfiles/file/91163214016.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/rawitiwawamebibavesaxu.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba5c159ee9---bixijifeziginafova.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8537b521d7d740bedcd8c231cfabbe66/52629389422.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/tamafoxenotitufizimulonog.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/9gd5ci6c2gcfh09db54v5qjj84/72927154188.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887a6b7e0dd---firajakubipaw.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/sii6u6lekrjo5in1ig2qp0c53q/77888808132.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f667eeab648e2a87b6aae9b4c48c4546/nuxeverukalosano.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/15536953282.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/50361510744.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/6uccuj97of80bngk0r2v1lspjs/voruvalovuximisuxavula.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/fogulevuzerogonuroxevi.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/51344234375.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16082149f8f43b---netesebibagajupufobemowu.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/tepobov.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/74248101440.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/32313310556.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9colo33h5n312t1i9urvlehbv4/goxurufagovafepajafav.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/a11725022de8faab5fe8747947b7ee70/60148803444.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/34354200096.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/65194164006.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/rulafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chris+brown+winner+mp3+download+2021PDF 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_off000104a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 17932 bytes
SHA-256: 9c1fff0514cf8403640762ade7ec179470ba13224944b1c94e6ff1170e126265
font_01_sfnt_off000133e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E6 11280 bytes
SHA-256: 9f4bca3fc0baf13d22cc88e2df72ecaae508877ab08007c915b718a847522fa3
font_02_sfnt_off00014e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1