Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9873e3513dd892e…

MALICIOUS

PDF

84.7 KB Created: 2021-07-06 12:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df5e9a0a227d28e8cedd0bc26c59204f SHA-1: 13d4872df09a62513264b01ba78d6da23cdccafb SHA-256: d9873e3513dd892ef032b3c4a9169e294b090eb36e7bedd5baf99f98a389d480
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wastran.ru/uplcv?utm_term=jobs+with+good+work+life+balance+and+good+pay
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/s8k42koo0m8mr20t0quprnn5bk/xewuwuxanimun.pdf
    • http://mnogonomerov.ru/uploads/file/lazumozusir.pdf
    • http://clubselectionvoyages.com/images/file/dotiruk.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719032de503---34127073313.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b90a00f5---vekilivuxilaralivek.pdf
    • http://omgmediatank.com/userfiles/files/jaluf.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c07bab8dd---jobimeb.pdf
    • https://ubk-sad.de/azubi/userfiles/files/koratutazanikebefokoxe.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c2b35fc5fe4064b9d85fd899eed3daba/78078698036.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb4bcb19dc---ditatu.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160bb45c0b33d3---sokefujal.pdf
    • https://hansenlight.com/UploadFile/files/fisikukujulu.pdf
    • http://keacg.com/upload/files/xuvabika.pdf
    • http://cdmvt.cz/sites/default/files/62314881938.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7b149b57e120489d0fa356b24cd9b870/89883442650.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/f59847726724115bba470078940ee9e3/46282034579.pdf
    • http://chiengthai.com/file_media/file_image/file/vorevopefife.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1181dd7fb---68791969349.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/69ae6522511994d0b53bf105bae1829c/takeduweniwivunariba.pdf
    • https://majubesar.info/contents//files/wikobefifezemelagis.pdf
    • https://an-professional.ru/img/files/file/46953639370.pdf
    • http://magooferta.pl/uploads/fck/file/jofetogaf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e979.bin
9c60d0d293c25d15218bb1514d2eff7e2c7f0485184a46e5472eb6bd4cb47aa0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 16144 bytes
font_01_sfnt_off00011301.bin
63f1d53f7c84132478120d5fe356be25c739a48287ff4f711a23a691d2d68de8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 11324 bytes
font_02_sfnt_off00012d4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4B 16792 bytes