Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4cc23668caa33c…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 17:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1cbd617eba926227719ab97936850a90 SHA-1: fc214af3b57a0d0dc979f89b96e1a3260c8caafd SHA-256: da4cc23668caa33cc42d2633c7d5f32cfc1c34922b29ea66e12d43e3e4333e1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to domains associated with compromised content management systems or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=rotate+adobe+pdf+online PDF link annotation
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/47204797775.pdfIn PDF document text
    • http://berbun.com/user_img/file/68830675787.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/42976304498.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/pixofakafi.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/53047713659.pdfIn PDF document text
    • https://laser123.com/geektic/files/79108198572.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/sajererirut.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/87199106874.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/dafakasanizusepuwinep.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/561556453e9b2d19d7119eff6a9022ea/57411309386.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/36102043084.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b69960d4f---41847231892.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/ronixanokovotemezetataxov.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160742f4346915---52216369338.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/71518216731.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/skm6o17fd1183jrm1d725uqsk9/3751734854.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/85960277244.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/668daba4ca5b5b23a375ed0c2a9c1f86/walabowexux.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57cddd846---babuzegawunil.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/xijoxetijelekorunufuduv.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160817fb4d1be2---ruxoremavoxim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 18912 bytes
SHA-256: e928c705d7fc16d02a4777d18a3181aae9eb2658c996006c404de892afac93eb
font_01_sfnt_off00011aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 10408 bytes
SHA-256: 9ef69bf459fbc48e7348a4ea6e12f387123b8e58ece159002d0143e10f00eb50
font_02_sfnt_off00013215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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