Malicious PDF — malware analysis report

Static analysis result for SHA-256 109cf50f13bc3351…

MALICIOUS

PDF

83.9 KB Created: 2021-06-30 09:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ec4ded92a6cde75f1daf6da03053d09d SHA-1: 317a4dff1fa43d776dfd1b740a070800748ceaf1 SHA-256: 109cf50f13bc33517f26f884580e06df534bb49316f39410cb26f49cfd60663d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a password-protected archive lure. The document body is heavily obfuscated, but the presence of numerous links to PDF files hosted on various domains, some of which appear to be compromised CMS uploads, suggests a link farm designed to distribute malicious content. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://namngonviet.vn/user-/files/89887488332.pdf In PDF document text
    • http://ihvanturizm.com/rsm/files/refeda.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b9a033bd3---22796961043.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/66pgg15hpkev1nju89492prndk/sebezekafojipasaf.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4cdcea582---43921043442.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/4874738728.pdfIn PDF document text
    • http://nkland.org/userfiles/files/katud.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/358f328acb07ded4fb0c32980c5ab78d/16255810396.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96100df674---28887377790.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/bezifesikikidosiz.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/87659895966.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9jfl6m0q0sim1itgt8f61228v0/tagunifozapojitovefom.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/93251821182.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6720f3b72---lozalizuvakanunategis.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/85089869629.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2eb7dfb79---wipixedagewutijubuluwibu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160db650f5241a---47410343004.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c3550503a8188e1a2bc565ec773487ac/49460248402.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/87723425759.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/998a9865fc4f3057d26cb4c329486f8a/15775121638.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/moxire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=password+protected+pdf+to+doc+converterPDF 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_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 10628 bytes
SHA-256: 028ac20d6e1fedabf94f9bfdb7a19f391d5b00c8906fc6fb32d7f46c7dcdf524
font_01_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 17136 bytes
SHA-256: 6a762bb33783ee89e7adbe486695f27e59bfa40a91d75f8c7470e7ba59be69cd
font_02_sfnt_off00012a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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