Malicious PDF — malware analysis report

Static analysis result for SHA-256 d992f736a3dc00eb…

MALICIOUS

PDF

88.2 KB Created: 2021-07-02 22:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fd7a27fc7690950c2b9b46737d8a2f0b SHA-1: af3b95097513021d0c69f1b8e011a1e44074a3c7 SHA-256: d992f736a3dc00ebb460d38e6ce064dd7c7f098558fb36e9bf17cb15893efc51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress uploads, strongly indicates malicious intent. The JavaScript likely serves to execute further malicious actions or redirect the user to a malicious site, while the link farm aims to obscure the true destination and potentially distribute malware. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://info56.ru/userfiles/file/bupowijavigobotusokokir.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d4bab42b8---rosijotevara.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/kelobabawarirexujunatem.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c79406629aa1cd8ce4fb002d08112224/11156660363.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d0e4951c6abf0baf600c0f821ceb61a2/vedebanadip.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/lidowasava.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/panibaga.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/68532099054.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2a9ed728d92a3a77de2f5fa20b3b6a8d/nixedemodozimo.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95ff12d36---xirav.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5363dd038---77297713328.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/nuxutokikudodirejaju.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc47954a52f---11164650864.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab5fa0bcd---79096574588.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092d645d6f1d---63116493396.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/82ke9jr0oto5t8m5cj0ms63v2v/88142099680.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ccba82401---50411595041.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/lesur.pdfIn PDF document text
    • https://tomas-music.com/contents//files/39725885993.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607175cfa39e7---54930514416.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160be1d1a4a04b---lutamavipeputezol.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f36298e98---83586998448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+does+it+mean+if+you+have+a+chip+on+your+shoulderPDF 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_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 20360 bytes
SHA-256: 17053235b39e0f85c45444bb00ff6a91688f63e5cfd8ef1bfec59cbad00949a8
font_01_sfnt_off00011f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 11156 bytes
SHA-256: 11d2298e51ebcf2d9467c0f1f7de9ab32028e7e5db56775ad718a1b1594a8d76
font_02_sfnt_off0001393c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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