Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f9e5cc0d44ed1c…

MALICIOUS

PDF

97.4 KB Created: 2021-06-26 13:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 659793aa8ed7e5a24f302da79f7fba75 SHA-1: d52f5c8caa1e72557946d1c25cc3621f51e51f2e SHA-256: 27f9e5cc0d44ed1c8e64e1f84ed838a62254d86920f5dd78ac243348781c7c24
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=alouette+song+meaning PDF link annotation
    • http://kondicionery-vidnoe.ru/upload_picture/file/mujanaxedabifubimuvixona.pdfIn PDF document text
    • https://reniuved.it/file/wudemerowivumaxakevizejum.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/2629629cf5ecc56a188219cbae199eff/nomidasejujinefokebetu.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/solozufemitomewopelesus.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/14077d22fc698f3b16b215abbc94bb9f/levopebuzigosup.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f2f83771---furezalezeruxisonuxon.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d46b94a5ebf---45889988882.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/11456791660.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5534b79c---1095451692.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/32088269363.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/7fa7617a8e50a3d1f7de3082b6390929/37823943865.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/zovipizivigakewovumuwu.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a8205d08f7d78c8b13b759048e49a577/jovobezelili.pdfIn PDF document text
    • http://merwepizza.com/upload/file/30160577945.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/e600972694ce5742a44223cb9ce2b2dd/sadomatejadanet.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/fazegivojewok.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/58t36ui0bpufgr44ahp7v33ioe/76737282315.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/vutirogu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hgqoov4fjfa44ce16vcjgosenh/podupesigawadawalej.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/fbc5f30ee4b0d820dc07565eb62106e8/45931106443.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3883a8ffd4---saruxil.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8d119fb52---delamelomigunamimexepa.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acd262b4a48---wuzixudasamobafegusorefok.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/zafugarizafugaraboroni.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a245f941d3c---10080470249.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9301bd63d4---39048705030.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_off0001175a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 10432 bytes
SHA-256: b8d1772f661ae67dbf54a135b932558d22d8a08743cbf5fc69627fea9ff777b0
font_01_sfnt_off00012f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F06 18588 bytes
SHA-256: 6d53bf81ae28f27184fdd84105548d5afd4757b01ae81b3035259a447c7c7939
font_02_sfnt_off00015ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1