Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6fa7ae2e5140f1…

MALICIOUS

PDF

78.9 KB Created: 2021-09-22 13:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b2e64acf9667ef0c5519fcd536a4d37 SHA-1: d20d600691edc3e4b77d59f9007a5829827f338a SHA-256: 9b6fa7ae2e5140f167befa7a899ac27bb62e6b61c1b8e5d3fccb345cadcf43b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and the compromised CMS upload link farm heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=android+tablet+will+not+install+apps PDF link annotation
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/3840a3e2b8bc96cd331e8cc3cff1d9cc/73534957646.pdfIn PDF document text
    • https://parkettworld.com/upload/files/xamezopemiboxogasekafak.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/bediwev.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/zezugefejok.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/3920890362.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161423fa5a4b22---gavesibenadamawe.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/15286919691.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/fepesedenos.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/refanaxijuri.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/tefadapemibu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/finezejovowopurukirexeli.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/pesatu.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/niladogijipazuto.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/baf9db05fd24c863f86f327706edb76d/47664390759.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/tafiwulepelotaguki.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/tufirolovulube.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6a0875e5---24211042161.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/20589663291.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9bf96a7750cac5a620d040de189cfb4e/35219687174.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/94723607938.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/fifufusa.pdfIn PDF document text
    • http://dellrein.ru/content/file/jagitibi.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/40072897294.pdfIn PDF document text
    • https://rajakedua.com/contents/files/25511532090.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_off0000d18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18C 17012 bytes
SHA-256: 4f4039f18de86d962348c03d9a539983e5f911de2155154d711abf332d28e00b
font_01_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001158a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158A 10592 bytes
SHA-256: c584d6704006acde633c41517210cb7d403bad6c395db9ca51ccfa026625b40b

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