Malicious PDF — malware analysis report

Static analysis result for SHA-256 1479953b02dee669…

MALICIOUS

PDF

93.8 KB Created: 2021-09-02 15:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79cca2a8fcced5fe893f5fe1edfb9d45 SHA-1: 9e582db5fdc835ed9ff89be44461fa84357e7880 SHA-256: 1479953b02dee66977cb5802ee3fa3e87d002da5892db50c193c4804867001e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URLs, many hosted on compromised or disposable domains, strongly suggests a phishing or credential harvesting campaign. The PDF's structure and content point towards it being used as a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=graphql+and+android+pdf PDF link annotation
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/nafinikigomezubagotivu.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/41722920071.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c5e35748d6d---78341793340.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609078d6ecd35---87850265166.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/pazadiwakebaguzog.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/crvg821gkho1mftuita28gvb27/51211811723.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b76f80296b---wumewoniwu.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/63656458938.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64131504fb---10365578383.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa612dae1c---wikisozejulu.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/xemasinokixumobo.pdfIn PDF document text
    • https://medtek.vn/storage/file/pumajisosegebidusaxajum.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/vmabk0776q0vv36frbrg5pop72/82739726837.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/wosewufopivil.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bb1c623626be4e262f999f5368d3977b/90843400815.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/lukinavo.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd412562fa2---74989237803.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/foboniwex.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609469364f147---17436999501.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d66dd4a1c15---fawobo.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/jarilulabixek.pdfIn PDF document text
    • http://otczenacts.com/media/files/lutanejosabivesisadina.pdfIn PDF document text
    • https://domilot.com/uploader/files/fegisojefinipewosijoj.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/84055664204.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_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 10384 bytes
SHA-256: 73ee47870936fbfb1208f6370c9b727a29fb7967fede3ca4c4000fca78b5acae
font_01_sfnt_off000120f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F5 18616 bytes
SHA-256: 34782889eaf145e43977a8b42f97527fb0ced89f8c1c053159251eeff90c54ec
font_02_sfnt_off00015190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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