Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a650bb636902bf…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 05:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55c493dbd4dbe102af24da0652f57a83 SHA-1: 4999936b60e1836132478f04cec4d695351a43ac SHA-256: 56a650bb636902bfb89280adf39fe8106966800cc3a9ec861fd1c9da12a80773
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://crysiq.ru/uplcv?utm_term=in+an+experiment PDF link annotation
    • http://etoprosto.ru/ckfinder/userfiles/files/94409616273.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/silibepo.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/75f561b466ca5f656892985361df114a/ninomasufugeleridoj.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a142bc5cbdf---kukepogerugumotanalipiv.pdfIn PDF document text
    • https://digiconelectronics.com/media/86113224751.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/1730829985.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160857d8f50a9c---vifilonozelaxupip.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/jexekafamiwobixuz.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093c2c657a8f---96686270933.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/kmbrfq5j480g38lfmshve8o3r8/19103988185.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/70196389613.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/dapimimumukewuwiwi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bd1324153---nekurakaja.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/4078081044.pdfIn PDF document text
    • http://babamoleskine.com/files/file/fenuvoxopexoguzobimajal.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/moxegerive.pdfIn PDF document text
    • http://stevis.cz/files/file/faxovigiret.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/rizolorazagewamefudotu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/08b58257ace8f24f44d8875f406bf567/54085062208.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160832e4e8943d---2852986961.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/16475432382.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1626670456.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3bad38ae6---76410549451.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a896127bd---dewumiluvigazu.pdfIn PDF document text
    • http://huntland.hu/upload/file/49033870993.pdfIn PDF document text
    • http://goref.ru/files/file/30690676170.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_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 10132 bytes
SHA-256: 211be2ea610397bf3cc38ddf55f43cf1da623d0d1d74bab45ebbf51e4fdb9485
font_01_sfnt_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 17068 bytes
SHA-256: 0d2ac189bc868febe725665029038aaef52e2b7aa289caf98dfdad21e0071aa9

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