Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfacf6b65a8b8de…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 20:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff91461d1ada212a5686027238d9a781 SHA-1: 6e2b037066af47a78de315a9609240185df3dab1 SHA-256: 8dfacf6b65a8b8de1df5345b0b90f6e474adc7267baaa50b65bdea7e91ae96ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to host and distribute links to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://allytemp.ru/uplcv?utm_term=leo+tolstoy+short+stories+pdf+free+download PDF link annotation
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c07114d9d---51940137632.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/fogifubut.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608366a75b726---sodexovibura.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/fixolexubunedavexoreb.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/imocpha3tvp9tlcn2agmpkavon/39272829217.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/mejomabijebumurerifumaju.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867a508d63d---gesilelexo.pdfIn PDF document text
    • http://shosholoza.de/file/75989464119.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ddd285ed3---sasufarev.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/5157892956.pdfIn PDF document text
    • https://actor-conseil.com/files/file/47956678843.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160960403232ed---garanebo.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/magesavin.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4789025982d4839e255955e82e2b14e0/tawezelefenodilivesive.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/63931347746.pdfIn PDF document text
    • https://theurbanthinktank.com/files/rigikafofofijukonijepe.pdfIn PDF document text
    • http://npas.ru/pic/file/vokuzo.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/21984842759.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ao91usn68q4tgn8p6ohafhopej/81386347237.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ffbee85d80c01cd5a1ddf8b0445f03e6/valulezulelijuw.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/16fae073fed9f922fcb8e76f090eaa34/lususivapixefidivenigax.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/38416280714.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/9adfef8e4496bdcfb2c19a1f680c2db2/31130583923.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/01a57b179f838c18db8e259c767ff2ec/zomesorulevugo.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/18491966817.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/pamazeze.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_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 16736 bytes
SHA-256: d40ed5eff857e710f25d1df9aca0b98f7ba21030fbbdcb00751877c6238b42ab
font_01_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECC 10752 bytes
SHA-256: 0979414070f44f0fa68a6d064269984ff77a886edd8cde602cf235396339423b

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