Malicious PDF — malware analysis report

Static analysis result for SHA-256 8574e3621b8e3aee…

MALICIOUS

PDF

101.4 KB Created: 2021-07-23 05:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ddc1925b4c23131d356343c65f1ca8d SHA-1: b307a089ac0fd18c5732a80902aa1de45effd280 SHA-256: 8574e3621b8e3aeea5eb4996c1ee6a52c89c3f813cb66c52f60861424f70c23b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://holtfamilyreunion.com/clients/5/51/517903a0238f10651a3d170edcbd2d86/File/ramidimur.pdf In PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb68d51e4c0---jefazemalole.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/xolaritusunibono.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/37026608539.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/kusimugerulodudafu.pdfIn PDF document text
    • https://cooperspick.com/files/wibapixeterazogi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/gd4cpisg53g8vqptpf5vd3ecj3/lekijatufenamupapi.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/xoziwefuranunibemulakuwof.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/098881b41e457f24b2a94d6d35ca9dd5/totox.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/dufetubezukebax.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887394e80b2---bifebaluwimumarej.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/wuwonemuze.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/reson.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700005d13cb---13074108555.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/zekigikejexox.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/30385491493.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b22cf1bc72---vuwovapanebedotakagog.pdfIn PDF document text
    • http://vejwun.cz/images/41887918067.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/lejizajavilopuk.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf6cca600e---70942137403.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65683b491---58685755875.pdfIn PDF document text
    • http://kme-kme.cz/files/file/58167889226.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/badikulilupidafanup.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/zomutulubanuwuvuzisifez.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/bejud.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/b4ed066bb0b58cf2ba2e3283296a0de0/80665158419.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b5769cc883e---wudulilomalezinadofosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=startup+investment+proposal+template+docPDF 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_off0001240c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 19204 bytes
SHA-256: 04abb36f826a3bb3d78f46cd71f9e556270dc31c5eb58381bce08b51b0eebefd
font_01_sfnt_off0001552c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1552C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D43 10916 bytes
SHA-256: 04f5b0f85695b75fd9a4f66c1e9580d9d5aa1a82deb5aa81b51af1d6f8991235

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