Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d696395336f3341…

MALICIOUS

PDF

126.2 KB Created: 2021-07-30 16:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: cb45b1d2159bdcea22d4765171eb7ea1 SHA-1: 36086de6d5a1fb1f1e140f96f652c419ad3f6056 SHA-256: 3d696395336f334147ba273e23d37c9c5a73559821d28aa722799a90114c8e15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=how+to+learn+organic+chemistry+reactions PDF link annotation
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/2nm957qtjkrpodu4v9g5ae7iqc/nuxubirapowowovukesaxalo.pdfIn PDF document text
    • http://temple.mo/userfiles/file/90650847111.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05cd0001cf---jikanoguvuxobuvi.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/rivuvukitoxetutewomibuke.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/28797567602.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075d08c36a54---34696547772.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/19820436242.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e8e124f30---98918419260.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fe283cabc---koxulonexaxunebumemij.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/14995543340.pdfIn PDF document text
    • http://df-foundry.net/d/files/24735914051.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160770097a912d---bozezevop.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/83469da7c82a1dce11b05d0b04a97a44/4546366112.pdfIn PDF document text
    • https://call-life.com/ckfinder/userfiles/files/20219558774.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd160227770---rumoxamidon.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ffe060fbd---tetokipego.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/49097763411.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/bobebajawuvixe.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/nowulorenut.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfd1ecb0ce4110652ff6a22242b2fc78/vuraku.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba4e304b89---90870751681.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/duzerekeridolix.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_off00018517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18517 19876 bytes
SHA-256: e9495b4ab879958cfe927f9a056d6442899cda002325a28554f7fc05de9010e4
font_01_sfnt_off0001b827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B827 10868 bytes
SHA-256: 4b86b229999ddf29721674be0abb4bca9acffa5e02d82c25514961a2ed6bc021
font_02_sfnt_off0001d11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D11B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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