Malicious PDF — malware analysis report

Static analysis result for SHA-256 d913b1403fa5c1e4…

MALICIOUS

PDF

93.3 KB Created: 2021-07-02 19:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: cec20273240cfa23ec7ec72bc8d8efe7 SHA-1: 4a1b8cda9f6edfde6635d743246a6ee05fa078d9 SHA-256: d913b1403fa5c1e46a47d54b7024bce48d6fcbea7ee03b4d92a4e4fc43ef17ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://baongochoa.com/upload/file/36284075138.pdf In PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f24b13138---51773587557.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/19300432970.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/65870430183.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/fujoso.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/57140792618.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/94698024954.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/febbd06b227fd059bf8c42b15af8444e/dotazanafawujefiv.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/refilif.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/14643938443.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/65682277092.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/japilozo.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/2461043031.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/6693ba415e670d14bceaf1392ad58985/92760296367.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f498117f438f29764400a437c81e314f/98023315321.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/lrm1m7110q2sbk0258lkh76s14/pirusivitowigepaf.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vjjk8vu9gikm2k7l72e1qvekvn/50497239029.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/87689822495.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6d2421781---40143266925.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6cdace0bbbe526ad95ea73af42a7d5c4/fategojivalizosarox.pdfIn PDF document text
    • http://soupworld.de/upload/file/kizidakupigomotoge.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609636c078110---32104724722.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768637859ff---sowuvoriribonasomavi.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/84027947570.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ttcc62rgc858kvtbefb354o08/69707521634.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/53175453870.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1942419379cd1e0f381389e854f7b2e0/97898068399.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210620230616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sexually+film+downloadPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 10628 bytes
SHA-256: c95ffa2163536395c840758c882ad5f99ed790e3f42fb8175c0d627edfb4e2e9
font_01_sfnt_off00011fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDD 18644 bytes
SHA-256: 2077f1ded91644f44bfd5d7045173046a38c4ff7ed89e61828a93d8cff963ff0
font_02_sfnt_off00014fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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