Malicious PDF — malware analysis report

Static analysis result for SHA-256 d990a0b180831022…

MALICIOUS

PDF

101.8 KB Created: 2021-06-27 19:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: b71091679b4f2cfee1661808228ec63d SHA-1: 7fad3fa990a64114df6e9cc71ad0119eaa119de0 SHA-256: d990a0b180831022a4291393dc977ca6dca716f02c1db8959d089c32d81123a4
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://fotobolfestmeny.hu/mvc/userfiles/file/vivejagobozi.pdf In PDF document text
    • http://www.ecvbrass.ch/user/web/file/88346164413.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd255aeb98.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/mejuladaveparoxiworab.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/biwugekitaluvoxosabi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b090bc0707c---4257526477.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/mamipasogafogeduxunuwobo.pdfIn PDF document text
    • https://quaint-house.com/66697902767.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea2de17df9---97867589269.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7a03fbb4f7cd322cbd81adf540f1ca70/zepawo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5a29e215b---93573446871.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/2oq22et85hthuc6sotlmmu850a/vuvogozirubisolozu.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607796ad24c0a---88699239220.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/umft2kub8kc15f4ie5i2hmck3q/36322049907.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ec0bedff8a160170d1e8f066373484e7/82777029089.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/jaxebafutatuvizatulimitu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609237e0b3b08---rodadoziwolonoxakufiluk.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b12014c165---jozojuzudojofapuganidakin.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/a7bi08bl298nv36bb5bteoq910/lukadu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/502f2be14aa70cdd82cb241f02eb7a90/gugotijegiponavopo.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/pj545lhdjfhsagu1hkn0ft5e35/xalesatiziwutexomexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pharmacy+residency+interview+clinical+questionsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A58 11148 bytes
SHA-256: 575e1969bceee6825c854c564266c13916d27a13d2a8375941507edb0662ded8
font_01_sfnt_off00014415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14415 17656 bytes
SHA-256: 57a4710b921f84f5db7fb6c45cfba680176cd068c6fe8ca566cd3c44370db788
font_02_sfnt_off000171ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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