Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45756994f5d200c…

MALICIOUS

PDF

75.9 KB Created: 2021-09-22 09:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae7ae04f55494cdfef29e919156f4783 SHA-1: 7762fdd6c5be62733d89ff371688d8eb99a095f6 SHA-256: e45756994f5d200c43e84adf038a776b024feddcd08b454157c24a7d406c9fe1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, including those pointing to compromised CMS uploads and disposable hosting, suggests a phishing or malware distribution scheme. The embedded JavaScript likely serves to obfuscate malicious actions or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crysiq.ru/uplcv?utm_term=bubble+level+apk PDF link annotation
    • http://www.leasebridge.com/CKUPimg/files/91506731180.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d9ab69897---79296532505.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210921124411_c0l2c6.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aca084e396---zasedaxogudenimoj.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/zuvubasopam.pdfIn PDF document text
    • https://maisonforville.be/documents/file/81282007341.pdfIn PDF document text
    • https://penzion-palice.cz/content/relokelevapulevemelemasi.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/820689146.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/73406347521.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c1e5db25d---wobatawudotenopidobesor.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/napatozotefet.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/nupenowem.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/71741961681.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/63476212922.pdfIn PDF document text
    • https://maturana.cl/upload/file/72278745064.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/zonufedop.pdfIn PDF document text
    • http://koala-al.com/d/files/11391554270.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aio92crgm6d0aarrdd7ngng5j7/57243069539.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/71400087720.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131688ee4391---8359244125.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/rizivelasirujudiw.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/72283582440.pdfIn PDF document text
    • https://kaparatt.com/images/File/60105414992.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/vamefebuxaxax.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_off0000c1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D4 19360 bytes
SHA-256: 065181d3f81b3b6bbbd0e04cb1a66f40ac4622388e3ec3cafd83c1b0b8e6f9dc
font_01_sfnt_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 10012 bytes
SHA-256: 05854f5e9cd729dd44112fd5051e95b05d7f740ed513a301a45dd7000e428249

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