Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31181d700878532…

MALICIOUS

PDF

82.9 KB Created: 2021-08-23 17:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b4422bbc082017eff06074a86b2b41b SHA-1: a40408fc7ef05d7086010a4556c25ecef06ca69f SHA-256: a31181d7008785322b097e2544260cea05d0baf47530d6339818932c5e8df1d7
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV. It contains numerous links to compromised WordPress sites and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://crewmak.ru/uplcv?utm_term=2+joules+to+volts PDF link annotation
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/riginoka.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/fawidirofekadu.pdfIn PDF document text
    • https://gilbertems.com/videos/file/juxawujipija.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/27842183373.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080648ab2b64---77981317652.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97dc06384b---zavoxodesonanolewasifeg.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2c064b9d2---binubitozexobat.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/55512249563.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/67925709205.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/5pn2vtueeanatl4hppds8fsrmf/mabinakixefugoge.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/57100599207.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/36070208867.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd77e3881cf---tebunadusirapega.pdfIn PDF document text
    • https://schmitz.cz/res/file/37363839217.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/44243355168.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16070a380a35b8---voradalatigejulasibaf.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/97165528613.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/sepojaganefezugolitagavid.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/gupun.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873cdb3ceab---sudujugijosuriviwaser.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/0923afbe1d47899830176973d86c3fb3/bajuzuj.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/96824360049.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/27938301162.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/2169857806.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/22524733915.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_off0000e0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 9960 bytes
SHA-256: df0495da18187a9c555b1979246aa304dfe4ae6765646e4a80ce657913060872
font_02_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 17636 bytes
SHA-256: 87031c93b1c9bd1a2df915b0fbd7ee31f965195e2f07ecf9a8a803324f88da86

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