Malicious PDF — malware analysis report

Static analysis result for SHA-256 f774f1d1749bb82e…

MALICIOUS

PDF

88.1 KB Created: 2021-09-02 02:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27aeb1fede96b201b27f39fa75b85a8b SHA-1: e61e18da31f34972723a8b1e25b4589d444d9653 SHA-256: f774f1d1749bb82e6fd1c9677ea4e0855cd89907629e099f0f6a47c9438d4fd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs and the heuristic firings strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b692c65c64aa2586447042c79e921b3b/memukuvibopalapumiluwow.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb7a36a076---dokos.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608554b6b6678---928064943.pdfIn PDF document text
    • http://vladekoservis.ru/files/texuzepemitususufikufujur.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/33571547346.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mlravqb3h0i5cc5v4am4v75sii/retadojowelu.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/82852332024.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/dawel.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/36079451691.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/famukob.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/47k749md24v5t16mmrt5d1vv41/soguvilafozo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea945bd1ec---19905564645.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/30351414755.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/7733124865.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/baposinozo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c429f783ff---zukanati.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/18464838584.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/venilesazizojex.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/faretarisadoxozenobafubug.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/21981868816.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/234acf2190ee711b8effcc93b6272110/14971911513.pdfIn PDF document text
    • https://kawanmto.org/contents//files/13536259153.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/71507244013.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/pazasufumurowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+know+if+my+amniotic+fluid+is+leakingPDF 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_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 11104 bytes
SHA-256: 050072de41e88f584914104f98df65e0fbff2d6d2a553ee52699aca48cb121f7
font_01_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 17936 bytes
SHA-256: 2bd7eb0a0f794218d58d24690abfe3ab3bfd7734b41f2b5635373f2b9a0579d2
font_02_sfnt_off00013a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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