Malicious PDF — malware analysis report

Static analysis result for SHA-256 77753b5d12db382b…

MALICIOUS

PDF

93.1 KB Created: 2021-08-01 05:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac656ac1d669caaadd88aecdbfbd1e43 SHA-1: 135fca7fc1c29feba5e1214625a97faaf7eda124 SHA-256: 77753b5d12db382b80b42be58bc671322a3e39d9908ad20d25061ad465e9f367
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0f80405e20ce08c01613cf1372ad846/99171523516.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/62249000364.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/jiwaganekerobopezalofoj.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6894dc254b---vipirirazusi.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096af6b23d81---69942273595.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/kutilobigabovabalefuz.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/37062cbb6526cc08b5d05edb4682a940/poserivorepi.pdfIn PDF document text
    • https://nattasampun.com/upload/files/71540585753.pdfIn PDF document text
    • http://esistore.be/userfiles/file/kuzugepotixunuvalapox.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/72594379059.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160800e9a17d5e---50442637794.pdfIn PDF document text
    • http://rubensova16.cz/files/file/38033821586.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/54140457359.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f56f24bdabacf9e7e7191c4327af8d74/guwek.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae99852e3e0---jabikejetalufakiwepofasaj.pdfIn PDF document text
    • http://bakoca.hu/files/file/81336087666.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4988d6b37bb416635087aacc33002dab/lofepilogadenenujotalila.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/7380698893.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/nazugerozefil.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/717b0fad57d0e7065f9c1fe42575a458/71983682820.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/tapeparenokedev.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/6a390111c8db14edd0089048ee1d0808/49288768550.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5947e9594---kevorezup.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b2228646a---9852688718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=moto+150z+italika+precioPDF 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_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 10548 bytes
SHA-256: 7b2965a4c76669b3b1da0e0d613d354b673cad5d9eaddf0f8e2426929606d2a0
font_01_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 19092 bytes
SHA-256: 24e3ffb584c0f31482ef633f9dc3b6df532119dceb7f2519b3bffe47bffc6792
font_02_sfnt_off00014cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1