Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea0b710755f81a4…

MALICIOUS

PDF

90.5 KB Created: 2021-07-14 08:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a678516e4bb018ad4187ef680e5eae6c SHA-1: 821c9b20f35fe32c5c4ecfdf15d1456b6bc63465 SHA-256: aea0b710755f81a443928ecead0e28c9e918e36829838c194539e219b8372e13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm, with many URLs pointing to potentially compromised websites. The 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic indicates that some links are hosted on compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV also flagged this file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://fsoa.cn/userfiles/file/vokutujanologafu.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812e4894c52---67278274934.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/xesamibabufovugijix.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/xezowisu.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/niiirsakjo82i9bdff1u3c3qa1/fafafigijorogofepotavo.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/melerireku.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/86801196876.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed353714a7---76263910756.pdfIn PDF document text
    • http://fairview58.org/clients/b/b5/b5cf5456a34e3fefef15e35162a7177a/File/23155920841.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/minefuze.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8abc740e1---46954259344.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff0602b71e---tekafesixevowi.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/53776336982.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/e4i99k5kvpqjcka0o3fgprgb4h/tatodatugonawomepigonuk.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/bt8nit6f63rl8tqqjc0dd9c4p5/23936486327.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/78b4ebcb6c59befd1da7249ed7e9fdb7/nerojuzolusuguronoz.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/gexapedozebumejuguvutefo.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1624822474.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/jovuxiluxagujuwimis.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/910773ed3c589e1df83176b2f9a45d2c/30329639584.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/fikimabuza.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092af618b9ce---7115418280.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2380d7486---10691524897.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608499a44adc9---46189726776.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/78657844442.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c49d55bf7f---5774277818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=iso+audit+report+samplePDF 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_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11864 10500 bytes
SHA-256: af3c94d5fe03611123e8bce7d827b140a22f672f9ce7affab6eca2469f6bd2ec
font_02_sfnt_off00013044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13044 16972 bytes
SHA-256: c4f4c8afe098b0dacacd7c0b796e676974486e58907a730662c4e5db18be6bdd