Malicious PDF — malware analysis report

Static analysis result for SHA-256 23351b0c1dad6d28…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 09:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bfcf316c1772bd6e3acaaa248d8c7394 SHA-1: 934aa2ef44d5d12cdb5e3f4f4761b791f7238bf4 SHA-256: 23351b0c1dad6d28ac0536d7b31dbfb0d6c57b848d8ef5902a35d25de5e9e7c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to host malicious content on various domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=to+all+the+boys+2+book PDF link annotation
    • http://emirates-offshore.com/uploads/image/file/87689822495.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/sqtspp6qb48v1p91o3tf9rfl5d/kufafibolavikabul.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a7c00a5a4d9a22df617060686c4847f7/diloxegitakisodip.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/69246387485.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/kilusidikuxelet.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8261a6b009---lewanakikova.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/dekiwor.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/49082507679.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/vabubokufamowezurowew.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/53728160930.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/peduzaviwazixod.pdfIn PDF document text
    • http://restorationteleconference.com/clients/73716/File/gimozedesap.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0e32f1c5---15211379380.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6ff98d524bcbf36f76b9e0167614fa03/mabekurerozurixoj.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/mobikesusaligoximuxasi.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/37411889986.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/27705433984.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/zogagobugutetimug.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1fc8c781e7e4ba324b61b4e8b351cf5f/kosobige.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd720bb4a0---talijefosod.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/sobutuzomusagorafetobomi.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/xaloluxaxetikekisududupow.pdfIn PDF document text
    • https://tonitomov.com/picture/file/sogowoj.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/furenafenoxejazulal.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bbd3b89982---nonoj.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_off0000d506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD506 10340 bytes
SHA-256: 0252e097e18b74b222cfc6c089aaed5f295b261ef780a99480fbaef8bb1515c5
font_01_sfnt_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 19012 bytes
SHA-256: 4d10b5ca71c0ff87a1854391eb99f71b551b9e3d8bc3cd869b2b29419d09bfd9
font_02_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.