Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2ee12a40582974…

MALICIOUS

PDF

81.3 KB Created: 2021-08-14 01:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a017c2cc841b4aa47d62f8b1b629b936 SHA-1: fb0c1678332f0a9f92d271b08cc360c21c7d5a53 SHA-256: ad2ee12a405829742fa50a820b411ec1f5a209cac9b3e8edf8dd425f279f74a5
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised WordPress sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links to potentially compromised domains suggests an attempt to leverage these sites for malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c07bd57cb---bazadid.pdf In PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/81598528783.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9301d49cca---balevojodubigeserevexu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609254c22538f---35338599036.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eab54744de---zupanogevu.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/gorolupegajesega.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/55059255032.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/didonavoweru.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/11951740199.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/f171f2226351b862089a5f8900e7d91d/tukireto.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/sevibejedupa.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/43266882306.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uqt638oc8l3nb9it8moi2gfgm1/bafuzemoganojobumip.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/49554997993.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jto2ha1svo7eq3bc0t247cdvp1/68322494688.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/17o8ngiant21k957751ojea5fv/fapakusaxotol.pdfIn PDF document text
    • http://riversreunion.org/clients/8699/File/nozipisotuwufuf.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/99ipa7uk1peauesisequ8ddavr/74259156320.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/21797271166.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/7mtbkdk3anlav2g933dg4dac8b/tivonutetusugof.pdfIn PDF document text
    • https://o-dance.com/upload/files/14610340351.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/7295701265.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/fovusilal.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1b7ce1ea42eef28bb4cf743a9a18b295/zafezolato.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b31c317abe1---32418913416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=a+photographic+atlas+for+anatomy+%26+physiology+pearsonPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 17512 bytes
SHA-256: 7c3dd6f9fdbea95fb75dd1d9d2fbf545fea7a8f9295427a3da0f7f75113749f3
font_01_sfnt_off0001051b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 10892 bytes
SHA-256: 9642d8b096fb3ca204c3ffbcb0c0ac79ba8eb3ddc6020f69fe75178cce20fdae
font_02_sfnt_off00011e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1