Malicious PDF — malware analysis report

Static analysis result for SHA-256 9329356a76ec07b5…

MALICIOUS

PDF

80.9 KB Created: 2021-08-31 00:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24d6b9aafef3066a879bca427ab3416a SHA-1: 81618f0c681d4191600a4e585c79c098855e1ac2 SHA-256: 9329356a76ec07b57931b1fc67e503c2634ffef590fc0e39762c6209ac0186c7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a likely phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://chipublichouse.com/ckfinder/userfiles/files/lerixosamojuri.pdf In PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/05f966aca3803a330352375fef8f4109/44120729642.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a926c1e6f3---39350058174.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106280124542164.pdfIn PDF document text
    • http://servmed.net/userfiles/file/27111467023.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/lalubinupowusoze.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/8270a480ef9775592ac2cb515a181533/kidedem.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/45369959753.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/eb4dptq1lbkj1ko6qqu1nisdh4/nogetugiwagamozekexobipi.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/sezefos.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/mabugu.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/34966732462.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021060219509_991107906.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/2865190879.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/ganazoxavumiludoris.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/durer.pdfIn PDF document text
    • http://nineslash.com/user_file/file/ferinoxaviwukekasef.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13dfd8095---20621738788.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/kouolr3bs7pb1o4kg955cfrt93/19184976336.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/mujibabi.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/nadafasajew.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/kibezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=html+to+pdf+with+cssPDF link annotation
    • 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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 17728 bytes
SHA-256: 2c5c89ad8b023bcdb428bd8fb1eb7acf7ff9a996128b2f80b560189d7ddfab14
font_01_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 10464 bytes
SHA-256: 20d8be7a3c826748ab71467c9f699cde429a0e31411f7579ab92bfa9ab8071aa
font_02_sfnt_off00011ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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