Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe22aed66a8ad51…

MALICIOUS

PDF

78.4 KB Created: 2021-09-01 17:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c9aa88157b658bbe2a46e320c57f1f5 SHA-1: 0ecf2acc5e34c8b313a0bcf39ad4ad46ce20b4e4 SHA-256: 1fe22aed66a8ad515a69878534985a99191aa7fe074333bc8b62819cbeb5bb58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, the document features a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute further malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://balajitutorial.com/admin/userfiles/file/vigikadamapoxevaliwabobum.pdf In PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/85b323b5c28df72b8e1cb679c592815e/33548262845.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/20710440125.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/gowipavanijubogar.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c1193afd---felizoweti.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/91112521267.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/9btj911psjg7n9vfiibdhv5kos/61781948992.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/sabozibuvudozomerezadi.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/32847669620.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609622cbed0e0---88891373370.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/3821904210.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/99446561445.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123aef0be733---3243701797.pdfIn PDF document text
    • http://texmet.pl/userimages/file/valuxazifutidej.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/80131198008.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01ed94d0f---vixemizuvuzejikulisopumi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/da4c3d5b10690b0c2dedcef213cdc306/pajasejoxuwejesogazabafi.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/zilediwilanomitiko.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/nebeki.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6r7j00vc4tigqquanjplpfh9p/88007617788.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/27317562878.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/xonomen.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/juxajafinude.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/vq0bfn0k18or71rf6c47hde4a1/47660415979.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/88342566474.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/zorijuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=this+is+the+end+of+the+world+lyricsPDF 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_off0000cd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6F 17316 bytes
SHA-256: fcf97694e3943bb9435acdd026aa1a5039245e68eb2325f17601b2fef54d5c90
font_01_sfnt_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 10572 bytes
SHA-256: e11cb6d6453b46128b3754d081c7fa5a842cf1c51f2cb8b5eb6b803d24c6937f
font_02_sfnt_off000112df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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