Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7a8cca078cea36…

MALICIOUS

PDF

69.3 KB Created: 2021-09-03 20:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 69de4753176aa64ecacc36fe039421a2 SHA-1: f5bb8390b696c85d9c4a2853372c990ca8fe48a6 SHA-256: 3c7a8cca078cea36e51ec584d2546cc277ae1006507e9350f29da335196cc45f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. This suggests the document is designed to lure users into clicking these links, potentially leading to further malicious downloads or phishing attempts. The ML classifier strongly indicated maliciousness, supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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://chcial.ru/uplcv?utm_term=soclean+2+cpap+cleaner+and+sanitizing+machine+manual PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/61c37ef5eca9f1a651d1ee984a05e4a7/mevafimobaw.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fe1f01dc5ff0f9b58549ed342d91503a/rekekuvutowefezadelumol.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e1970194ef0---37723112239.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/gifapugepujidewoxat.pdfIn PDF document text
    • http://aqcons.vn/upload/files/newivul.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/54281598876.pdfIn PDF document text
    • http://c-amc.com/upload/files/33155658779.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/bufojosob.pdfIn PDF document text
    • https://wagaskar.com/media/terijig.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/logufevirevuju.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/nigiwe.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xanika.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/258a2fcb43f8e6efa4998f336e82c98d/98480532267.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/30540372828.pdfIn PDF document text
    • http://iwishop.hu/file/favejedinejisusurunu.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/67835266958.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/jomupemoxox.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/22249973512.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/nuboxedizubulunob.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/tifabelenexewojegomapexa.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/sijomorepita.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e712b96e6bcb2328a9def3e2a0f965d8/gapanixaxejotufabep.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_off0000b048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB048 11316 bytes
SHA-256: 4dddd4791c950e5d4adc70f2c7035027a38219af5afe328e71db2428e6707dd8
font_01_sfnt_off0000ca90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 14892 bytes
SHA-256: 3ed8500a8a8d39cea358097b172fcb26b12e7a7e5be57a9a4c7eba63ce5a2163