Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9579eb15e5fe2c4…

MALICIOUS

PDF

74.5 KB Created: 2021-09-06 02:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef750676ceb8b1d113d230dc996b726c SHA-1: 364179615e895eafee91522351157c8e48c1076c SHA-256: e9579eb15e5fe2c45d823b5f55f5d809fd290bfce9c5cf505a7b63830a7514c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://inwebjor.ru/uplcv?utm_term=infinitesimal+dipole+pdf PDF link annotation
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611b69e994aca---671916504.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202108140736296331.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/cde8b1ee2fbe83433b2de5d399c09ca5/75543106217.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/583dd94a5528e7db548a570e0881dddf/78961506790.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc4e52c427---99393897551.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095c8333a2c4---1256117501.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210519174310.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb59019a0---59212346484.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/ponosomim.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/17604687591.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/4018421b87f9072c0228f7137f772fa7/24540486802.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/467c4f77c3a344e049be4822e5f9539a/joguvetinugax.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/82342440335.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tejesujolokidafonub.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/17925068242.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/xalinavuxa.pdfIn PDF document text
    • https://petek.biz/resimler/files/fadekiwivim.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-8/20210708191024579996.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c0b217b88a385f3691b310da4006526b/sogosatitavapukimigoga.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/wipipogureli.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021083113561673499.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23bec8ac5---49889512739.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/24370355523.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de895a4c1---podom.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e570a58be2---nitigosizasosadukifevine.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/fa57412e1892643a39effbc9d8237d7d/sekiw.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_off0000c12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12F 16708 bytes
SHA-256: adb824ce275c9880fd47ee20442a5373e7a8826bc954d51d18136c7499e5ee6b
font_01_sfnt_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 10508 bytes
SHA-256: 278f54f8810dba5972e9c678180971ff23bb4a02b14670bba93929432f4584c3
font_02_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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