Malicious PDF — malware analysis report

Static analysis result for SHA-256 4430c3bfbe0d1fbe…

MALICIOUS

PDF

100.4 KB Created: 2021-08-20 04:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98406db7aa2fedd38811ef571a69c1e2 SHA-1: b1860363cfca5b433da9915df205bb731eb4cc50 SHA-256: 4430c3bfbe0d1fbeafdb9265e33605a12099cfc64efecae1ead2a64821da6d31
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be instructing the user to open a password-protected archive, a common tactic to bypass security scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=orbitaller+konu+anlat%C4%B1m%C4%B1+pdf PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dfd4e0a40a7b68a39c522e4d0a5ff879/mebuwefakunawasoxepu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac8402c7a---rejiruxezisigan.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d066741621173fb3753b5154f6d16a4a/85968003108.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/filoximajajitosurawarego.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/7398382092.pdfIn PDF document text
    • http://www.bash.cl/media/file/zoxisuxulavipifef.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/25642447489.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/d31f1db752043f76832ce1490f615acc/5197472656.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/6260502423.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/rapejuwijiwibojomilan.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/73941932730.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/thcpdl01siojo7e8nosopan30v/55019102789.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/sonagufaniwojojez.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/wudirituzadok.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/zataxegajugipudadotam.pdfIn PDF document text
    • http://hotstamping.pl/files/file/33616567113.pdfIn PDF document text
    • http://arslanemlak.come/file/wipavudija.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/96471369156.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/55386004020.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a57645008---tomojuxegadagudalozo.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/18331311431.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960b79e92ce---tubijilu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/woruzimepok.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11323 10892 bytes
SHA-256: 61f2a49e6d33c37fd74467c66b057b6e94c004aad7ad33d8f1ae88cbb08704fa
font_01_sfnt_off00012bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFC 2536 bytes
SHA-256: e3beb9e335cfcf161b9d664a7725ce6518e43eba0b1b6b479362adebd300598f
font_02_sfnt_off000136e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF5 19300 bytes
SHA-256: b9c3c5836cb715cb063955a7bcf1d1fa2126f5a5654c39229c36c1ed302045a1

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