Malicious PDF — malware analysis report

Static analysis result for SHA-256 2795d0ce06ffc4d9…

MALICIOUS

PDF

87.0 KB Created: 2021-08-20 02:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ebe2a990e77c75f2558961cfe7324733 SHA-1: fd238f97692572e1777ab4556b938eb0ef0868a7 SHA-256: 2795d0ce06ffc4d92eb6c7b1a1c3fad0ffe62fa2b4acda3e210507e35dc97020
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to facilitate phishing attacks or malware distribution. The presence of external URIs and link farms on disposable hosting suggests a tactic to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://krisoc.ru/uplcv?utm_term=instructivo+control+universal+isel+s-59+codigos PDF link annotation
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e81228a7bd---79701951231.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/jovepiwegibe.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859c8736721---wasudimoki.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b2aeefd62---jedemunidogukebedofirar.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/benadido.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114c5df28de7---29516895366.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/rorazufiruzadiwizek.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbfbe2d001---93968271285.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/beacf22ab8b11127156cc07c96a5197c/xugejobini.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/wuwetitedote.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/28019308351.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/jenudogonexegudada.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///buloxadogukaf.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/oql3er91kbahr3p6s5t7lsj8s1/52273149783.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/7836562005.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9686ed8d4f---89282495463.pdfIn PDF document text
    • https://angkalaris.com/contents//files/34065528786.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/21230495125.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/bavazavasawov.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d091e4cd58---jatemugexuvisemuwulur.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/80a16449497930f667d90079d76db582/46541259579.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/dezogegunozodejafagoba.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/51980304202.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_off0000e9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D3 11000 bytes
SHA-256: 9335bf176b83ba5873ac168143488e1eac1fa27651c522b4ac36362d9a4cb03c
font_01_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 18980 bytes
SHA-256: f2c0d9d6f8a8d24cb8fbe689f1a3dff91963b5a8ddd97fd9ed7b60607598c18d
font_02_sfnt_off000134c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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