Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df7d116d211512d…

MALICIOUS

PDF

105.2 KB Created: 2021-08-05 21:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ccaf929799b7e9f481976cf0469e8732 SHA-1: 2f72f83c51fe3fbe1a293b8c5a055074de1ba1ac SHA-256: 9df7d116d211512d5856b9b0a5158a3aacf8f591b99b237a3126688a31cf8481
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a focus on directing users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 6

  • 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.
  • 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://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c852f3dfc---62417073537.pdf In PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16093015757b78---37306269879.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe587d0252---rawug.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7b8c6383---zulodezas.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/jujud.pdfIn PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/zuwirugukidewivotinuj.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/54cd412a701d42aa7d1fb92a9783dbcf/10299054884.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/rnfnt7stjc8v2gpijd61njaqj5/kidad.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3c26b0e60---fowiwunawafomowarizorilu.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/navetokevelunid.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/86670113778.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b013ae79780---14897404870.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/wutegikewig.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/82690289718.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/degirezajubovalesisogam.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/34e685789159955acf76428bb666ae62/15731452742.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b33dbd5d0dd---kujidulutudawelum.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/cf9144ebc2d8b1d9effc0631f1d54fd7/vigasasirof.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/j9crdv1uuor435mfhojc9nq9e5/65372828751.pdfIn PDF document text
    • http://edelstar-mos.ru/files/wivoxipeniforovin.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/10690589828.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/92783359622.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/85aa18d744bc848612e95ff9701a6f60/1768988936.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/54161830812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=exemple+dossier+professionnel+transport+voyageursPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11849 21376 bytes
SHA-256: a31efce0ece97b4f94ad41c2fdb2e33235ca1c94b468f17bcea21f7fccebf956
font_01_sfnt_off00014ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF5 16092 bytes
SHA-256: 6736e93884d37ca4bac8e0e77dd264f54612af11195ad5831ba71d5ecf972052
font_02_sfnt_off00016428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C3F 11204 bytes
SHA-256: b0b2d28072ddf6d9546dcdfa50a6d8946e15a6b7a055cc4c8b069d47f92cf5b0

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