Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e33d55b4032e5cf…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 13:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06bee69032662201b08bd584e7f5430b SHA-1: e07c89a7c32bdb4b2c4f026dee9862265f1d6957 SHA-256: 6e33d55b4032e5cf339b45f7e78cc45565a7c46422c1baf1e7715cb355c2c00a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=endgame+stream+online PDF link annotation
    • http://phrabat.net/UserFiles/File/39715522572.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/88591187719.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/63170095829.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/39852593432.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f6e84e5e---27594030612.pdfIn PDF document text
    • http://ossokahve.com/upload/file/ruvumemibifa.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/97478422357.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/61394590872.pdfIn PDF document text
    • https://allianztc.ro/files/file/92201163969.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/niwixekapof.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/44663282352.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409d5130c1e---84710284361.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/lanulibukavuramozo.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/fidixufu.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/zotemonojomadegu.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/50353524575.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/16112601879.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/621e3a0673200295a1bf8d415e9fb894/35224662364.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/70919123089.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613960a69848f---razepov.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/xageligamaraweminug.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/73253308408.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/92496105290.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/23762009798.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_off0000e2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 19396 bytes
SHA-256: 5766f22489ab02cdc8f885fd3340ec5da56d674b10a7174d4a7729dd5cb30452
font_01_sfnt_off0001157d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157D 10572 bytes
SHA-256: 59f601c2fce346e48ed9747d31fa74c7e2dece7bd6f9672b829b4fb08061014c
font_02_sfnt_off00012d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1