Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1d34b2e795722b…

MALICIOUS

PDF

75.9 KB Created: 2021-09-20 03:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 67938408ce154843dd038fdda2c84acd SHA-1: f79e168dd2b047d65987fa0c4a0ba69692cc8cfd SHA-256: 4c1d34b2e795722b1914c2d3cb066947b74238eab47ad0149140097828fdcbb7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=bowser%27s+fury+apk+download PDF link annotation
    • http://praxis-greve-polley.de/web/editor/files/xudoxorejemejabepejanubuz.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/tonezu.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/82192560551.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/fusalarufe.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/874e1d0eda6d7355ae4946f625e6fbf7/48393786660.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/kexavejidobesodusewuj.pdfIn PDF document text
    • http://xn--12cf1djdb6cbcafdbu1f1cudgcc8am4wf7htgd9de.com/ckfinder/images/files/89882072971.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/depupan.pdfIn PDF document text
    • http://erictex.com/ufiles/files/tibezezokebegado.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/somurutilexej.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/gipozizudoborosoj.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/10149161151.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109120731131887.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/dizekuj.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b78e395da8---dobujegewipini.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/38105669943.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/54182873723.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/80318348290.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/rugujotizidubudamifu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/82037810630.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/nobomiwinoninumapezi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/12450a7d992dd1e019c200cd624cc5cb/fudonofimunixuwur.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/98019496484.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/47284556162.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_off0000c613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC613 10780 bytes
SHA-256: 72e1dcf8e1acb31a4952b3330264dfba5da88381d9f20206e5bb8896460a72d6
font_01_sfnt_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 16600 bytes
SHA-256: 97d7e4716fa78f42ee97c52947801336cbf81927bbc292d12ae878bebeb577da

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