Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71d774ec8911dd5…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 02:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9bbe201dd07faa9ab8612d85d9a61ef9 SHA-1: 3445ddae5d61404f9561494fb654da1a09d37191 SHA-256: f71d774ec8911dd51d3ce561a1babc2be27dd54e3a18e752bcb28ee17f8b9ea5
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains embedded JavaScript and numerous links to external URLs, many of which are hosted on compromised CMS platforms or disposable hosting. The 'SE_MFA_LURE' heuristic strongly indicates a credential harvesting attempt, likely by presenting a fake login or MFA prompt to the user. The ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 http://studiomanzella.com/userfiles/files/deresipeja.pdf In PDF document text
    • https://pearproperties.in/userfiles/file/palekazakajubiravo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed0d5e695c---gizodorab.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/titexugij.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/n09mchpubhrcr72f8sml1fvu8r/lefaper.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4c7571754---tudugugoletosetiku.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/6a73191dd4163b0debbb2bf793ef4d92/49611314188.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/76729306419.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/lexivoneb.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/85378878966.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/lovusanak.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/10598894410.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/34786085395.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/e507aa06523e9eb0811bda4249b1a89f/somumij.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/06e8d426b316de1fa2798b89f0726069/joresidono.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608470471b355---rokevegikemasajila.pdfIn PDF document text
    • http://livestocktool.com/d/files/gozijamivuzawexaxonow.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/11641098304.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/revezididamapinumif.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/10295559529.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/19405219974.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607604539b906---40838359275.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/67040723461.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b869a99c445---zibirox.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/37347451882.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3ksagcjfv7mmaclq6sou9bai26/dabapobitakufureni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pan+card+form+pdfPDF 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_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 17804 bytes
SHA-256: b2a71fca67f5cdc937c8ae98dce2c16570fb46799e76242034c139ff71caf5b9
font_02_sfnt_off00012e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 10248 bytes
SHA-256: 5ff0e5f486874d79373c9d04ded55836907a2f6c684a91cea0b24d44f843004b

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