Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47f313091dc3a02…

MALICIOUS

PDF

80.9 KB Created: 2021-08-28 11:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b770bc9dff821a15c1f483745c496955 SHA-1: b3c16833292da85c094fe48d5030706b6e6c8819 SHA-256: a47f313091dc3a0256165c69b467c87c5ddbc335dd404b49d4cebe3c55b7a041
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues to the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ppntassone.it/dati/upload/file/xumomos.pdf In PDF document text
    • http://architects-desk.com/uploadsfile/kavakufijetemomo.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d17c7c54a885efd9a1a9cec4b0c8d819/pezovudefexad.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/792959535bebf5f0687da77f67541ce1/4604803513.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/52970743607.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797aabd3a0d---42767847441.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/20299823685.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/55506980136.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/21536575547.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/xegojaletasadaz.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/sazafizamixabesuzunijub.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160856943a755e---tujevetazapaxexajijelojim.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/rarovojosixikudufe.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/zukirujigavinanitezinetiz.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/kepik.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/watozapunigubu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1c6a64778432ff26aa82e46c1a9d8a2a/ketusujugesowo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b498ddac563---zegetikek.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/jekipugasopewozajovedep.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/86926877164.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd203da92c---naxolisiniw.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/fdd62e1f067d425c5c7c49488b23d89e/vifiruvopusisewudegedo.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/numosefij.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/86025929895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=non+material+culture+meaningPDF 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_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 16916 bytes
SHA-256: 29ac0cefbb1c5d57a9c2f57456ffc16a756449e03b67fca2f793da9f373a6b29
font_01_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 10480 bytes
SHA-256: 80d6c19ae7e56034fcb5f5da4b6fd9d68788f3f34f2fe44ae322626dc8dc01fd
font_02_sfnt_off00011de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1