Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7479347358544b…

MALICIOUS

PDF

99.1 KB Created: 2021-08-08 19:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09c69b57af437f066abd9ada8a588ebb SHA-1: 59b1e326627158351f0a737f0c9791a853523e5a SHA-256: 5c7479347358544b1fbb6b37044beea0a0d519f16e3cd36c7efcd3b5a34da1ca
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and UTM parameters in URLs indicates an attempt to obscure the final destination and potentially track user engagement with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crewmak.ru/uplcv?utm_term=dream+league+soccer+20+player+ratings PDF link annotation
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/57538469115.pdfIn PDF document text
    • https://aedwea.com/upload/foto/mikofamevofaperafarifexen.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/18420888804.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ffd267acaa7cef6b33a1af2c9b323371/nejoge.pdfIn PDF document text
    • http://brukbet.com/user_images/file/65133203796.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/61352190958.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/limotefifididoloxe.pdfIn PDF document text
    • http://mousike.it/img_ins/files/43710758948.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/8826109437.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/987e2c2e16309b4bb05e61bd3651a797/67870040131.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/xutomenifebofafusaw.pdfIn PDF document text
    • https://majubesar.com/contents//files/26112097842.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900709aa0c7---nefipixefa.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/54496951252.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/13785444308.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/zadaguti.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/pivogipogobizumibutamemop.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c55b69cdd---98889267023.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/291923419979.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/67578660997.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905a638d510---voxizufobibakanesilike.pdfIn PDF document text
    • https://bataretak.com/img/files/file/likubaz.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/m8r1k8eglps9ihrm0121vh5jm2/wosoxivotijuv.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/3055cfdad700210970a2a8be4178fef3/6952280531.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16105edf2c989c---43812889364.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_off00011b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B64 11176 bytes
SHA-256: a1a646f1c1a22d5ef326e0e6f57b1edb1eba468a806a9753b7fc021e90b02bf0
font_01_sfnt_off00013596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13596 18196 bytes
SHA-256: 80c6f60a58dfc3b934d399783b7f3a147c692dcdc871918cc728db29ec17e5d0
font_02_sfnt_off000164cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1