Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd530a385bf0a6a5…

MALICIOUS

PDF

88.3 KB Created: 2021-09-02 00:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f84b4528e81978657f91c3eb8b0ea9d8 SHA-1: d5bfb9409a71f57e5505feb861d11d4e8e7d4516 SHA-256: cd530a385bf0a6a5c93024486ec8ac404353438d564a076cf721c77cc4f2d44b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://everestart.com/images/stories/file/93424573356.pdf In PDF document text
    • http://alpha-th.com/userfiles/file/25540987513.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/95590244085.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/820943d6720325448e9a7027a76b8079/14055824267.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b347287b4---nomujunibuloka.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16072d8ace7980---55542008552.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a491885218---fizokujagiwabepofebi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/g1tefh0qf57gsqd75nm6b05nc3/68062512476.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/0a2962947be87d38463c63944e3bf5a5/1516272318.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/raziminamugapexijebe.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be25412d450---59016722635.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/44963472213.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e8185481e---6002048939.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/mimir.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/45836916333.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/64107842633.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/62731968939.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/79655f4dd3a169d2191afc0f749584a6/teviferofefuxifak.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083ee57bae3d---52564006919.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/74297139669.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/pixoxafukadikosalape.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/997ed9cbe79c9f8f8e1f7243e1b8f266/mabepiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=alcoholics+anonymous+4th+step+worksheetPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a23225d817be72cbe18059b14fdfe337/wipafikulomi.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_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 18176 bytes
SHA-256: 80c188e9ba4050443b46265a06d3c788560324724fe10a080e06d7b3cd42a0d8
font_01_sfnt_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 11088 bytes
SHA-256: aec96a0ca5d6fed1abfdcee6cf9a0794959e20f659e08b53dcb1734e92371186
font_02_sfnt_off00013b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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