Malicious PDF — malware analysis report

Static analysis result for SHA-256 797eae6972ab2c95…

MALICIOUS

PDF

76.6 KB Created: 2021-09-17 15:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4629c905c024f5b90b31f0046268e4d8 SHA-1: 456365817c94a900c92c01031720969b44964b15 SHA-256: 797eae6972ab2c95309bddd894cbe59b976caa0594abcd3256a07d5d55ac1983
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=karnan+english+subtitles PDF link annotation
    • http://uzks.hr/upload/datoteke/werupizulonogawawafe.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/75098270349.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/77758127866.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/37449330902.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/xikizutekore.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/lufarosapotezapasuvulun.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613568564aa37---tajijazurakazisejoguj.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/susevifidokizimom.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/9825759800.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/27435926359.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614231a3b1588---35135524449.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/299c10b333fc199a8700f65a39f60c1f/gevitetedajonuviguvale.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/16946598606.pdfIn PDF document text
    • http://prograsifkalip.com/files/98378668784.pdfIn PDF document text
    • http://araonline.hu/uploads/file/85412034457.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/41663686594.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/99410062899.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/10087136822.pdfIn PDF document text
    • https://www.confirmedtour.com/files/rumigiborefefuwufaregoguw.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/rupolazumunumutupefe.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/90815427340.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/96732796404.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/96815650039.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1e47fd27---42952073551.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_off0000c6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C4 10496 bytes
SHA-256: 3584926b2ebdb6ff918dd2a3ec2669e04afe7300490c3560014ca2b6c5a273eb
font_01_sfnt_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 17572 bytes
SHA-256: 1a823dfef02f488cd3b56de8edab324946f3508e5ed4afdfa3e9fefcdf68a2d4
font_02_sfnt_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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