Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5be97caf5c097fc…

MALICIOUS

PDF

87.4 KB Created: 2021-09-17 18:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e76dab6531909ea0371181d976e85d25 SHA-1: 773063d7261e3ca4dffee7cbb792b4f34746a5c0 SHA-256: b5be97caf5c097fc5e42e3e02289fe43da458b5fbe8cbf5d4ad263621474e83f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://garglob.ru/uplcv?utm_term=best+clash+of+clans+th9+army PDF link annotation
    • https://billionbosses.com/ckfinder/userfiles/files/bejidonaxidolopovavi.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/malatuterepeka.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/sikononapiwerol.pdfIn PDF document text
    • https://finliz.lt/i/File/zazukokijakovosuxisujodab.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/93340404930.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/kepepinopilaviduboba.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/94570449643.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e674162bb---nikab.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/94031080702.pdfIn PDF document text
    • http://sayarbobinaj.com/file/12868893542.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/55706267359.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/babirumugagesifegik.pdfIn PDF document text
    • https://basisnomor.com/contents/files/58824999072.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/wimekojutajadejid.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/zejarawobaf.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/7708768463.pdfIn PDF document text
    • http://chemicalengineers.ie/images/pexofuve.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/64340430360.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d626da5f13---punuwujeb.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/jefonez.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad269a35a---72944945720.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161365d30cf831---sizawiwaje.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/42660104957.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_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 10844 bytes
SHA-256: d2a3eb62e79bb14e9d473e520d9aa66fe265e264e619ea28acba6523a0118ad0
font_01_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 19328 bytes
SHA-256: 6b9ba6b75debabc6ce8fa93db383923c5504df4f1490c245db08e7959a4cc0e5

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