Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61433cc6b77ea3c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 11:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ee555778c9855d7c5231ab748aba930 SHA-1: 7a1187656c1d65d27ba41fa39654d7de1f5ad842 SHA-256: f61433cc6b77ea3ce6e271f70f8bd27476174a9a56a7feff93d6998f3c26ba34
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised CMS upload storage or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download and execute a second-stage payload. The presence of JavaScript points to T1059.007, and the nature of the links suggests it was likely delivered via spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • 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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c36cb639a641ba444bf4c2774065440a/rijetofulapabusigus.pdf In PDF document text
    • http://spamsmsgiare.com/media/ftp/file/vukexivalaxanum.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/86329774592.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/dulegodilu.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/64674625248.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/20631107660a74ed00797a.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/78016798413.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/tamaraneguxiger.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcae84966e8---86282961206.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f2fd9473---ponulirilesilazokejanitas.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///volepugedonizuvuwomiwobe.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/52605532336.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/wanivoseb.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/70597124944.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///kelemejozinobujigoje.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079243c1ff63---vuzuwugugalugeto.pdfIn PDF document text
    • http://redactron.com/userfiles/file/wotabanem.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8ae276dc4---38839071540.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/fogifenunizurebamuv.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/17310423520.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/95680607037.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107c56a85f83---54056779051.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/94126fb685562c6232ecbb99d8881d8a/63078407382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=masculin+feminin+adjectifs+exercices+pdfPDF 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_off0000d8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 10984 bytes
SHA-256: 3c54f7ac11afb338752e9c3963538f9fde2d0df632e4f73886fb1823f721d488
font_01_sfnt_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 21700 bytes
SHA-256: ea131f3c565da8072a206febe9d72b261ac247b45113300762c8b1f3aab0279f
font_02_sfnt_off000128b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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