Malicious PDF — malware analysis report

Static analysis result for SHA-256 9940af0f0a3e0ef4…

MALICIOUS

PDF

69.9 KB Created: 2021-10-03 00:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 336b2c63a993bbc78a392542e6e0c330 SHA-1: bbde2428895d950faa0c3642bacea4c31f51c77c SHA-256: 9940af0f0a3e0ef499202c83f0f2babfe996905d55d84849077742c39c3bffd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=mill%27s+argument+for+utilitarianism PDF link annotation
    • http://top-caster.com/userfiles/file/nudepufapenenerixe.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/64111296425.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/48857235330.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/kunisalegimagelogazebojur.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16135a0bbc2054---vavafo.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/89810017715.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/6329280352.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/sisatudegakukise.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/koruvagekovugixesi.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/vexeseje.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/25413315608.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210928_94559E212ABC7290.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/sekavamuwi.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/1728215636.pdfIn PDF document text
    • https://bak.vn/upload/files/92880577784.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4rsa3rlv93amrpdhbofs6epgi6/tuwomimupapoge.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/gosijekamatowonajujirogud.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc778a575d---17848662248.pdfIn PDF document text
    • https://codecs.ro/images/file/sujokelukifujuvotijeta.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/84156361591.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/dazokero.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/semoweke.pdfIn PDF document text
    • http://ruresept.ru/files/file/63529042309.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/57912734629.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_off0000b268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB268 15368 bytes
SHA-256: 00dd7e0454afb9d11e3bd460711f80929af5433564cf933bfbac5ad798be65db
font_01_sfnt_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 10684 bytes
SHA-256: 7586ac35f7a49898ebe58d1f4ec0e791d2ebd1c2b75a6b107243833951ee7b86