Malicious PDF — malware analysis report

Static analysis result for SHA-256 e353288d2b59721d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 06:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 034592e91c3a20ba14655d595474e1c9 SHA-1: b825080fd39d85f67bd93385e22e9ed8d71661fa SHA-256: e353288d2b59721dc57e427cd0d8557a2f1e5c41c2c8bbc3c859a206872d714e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised or disposable hosting, suggesting a phishing or credential harvesting campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing further malware or leading users to malicious websites.

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
  • 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://tpt.taipei/asset/uploads/files/76390090587.pdf In PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/xemedilesunikevib.pdfIn PDF document text
    • http://anpharma.net/upload/files/98464685445.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/nusodakotipowedewuweme.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/zezezovaludogesixovo.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/61511259446.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf13fa84d2---4690935887.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/87083039970.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/vifoporufunumivemikepu.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/wumuvotedet.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/wamuzomigeguw.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/35849801278.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/45750281365.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vrkfjo233a7uko5obffs31cbb4/limokikapaxepoxemefe.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/81697833346.pdfIn PDF document text
    • http://saaretravel.ee/images/file/71689496174.pdfIn PDF document text
    • https://plasy.com/uploads/file/8241445769.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/46242418067.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/pusiwobupinogewejuwa.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/baxezeledopogofakefa.pdfIn PDF document text
    • http://hrudolf.com/userfiles/sijurirazalemigeme.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f80bca061dcef1882c9d988bd6b83053/datuvaxetufi.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/64464741596.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/xajazenobo.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/72606063851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=you+may+now+kill+the+bridePDF 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_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 10860 bytes
SHA-256: 7dbc499c0fb064b52af35b92fc0d61c25cfc4206fd6f8a933e71b1818fc13ef8
font_01_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 17904 bytes
SHA-256: 7f86616ae00f39ce431ebb8236d3b6533510ba9d697c02381ca84c4ed2466790

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