Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1c95183b2ee02b…

MALICIOUS

PDF

95.7 KB Created: 2021-08-12 23:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1016a76d24a53dde36e7d12f08cf81a7 SHA-1: d921c91ef53ff963c2101c80c8714d19eb126419 SHA-256: 3e1c95183b2ee02b36a51a4620709f98fd7003f43c109993f7bb8ea3789245dc
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate this PDF is malicious. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate effort to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://tpdw.pl/userfiles/file/15658704700.pdf In PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609444fbc2146---86671336988.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/xujetobatefufeg.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/def5e824563388e66fe0ae8e0b0c43b3/41751316785.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc247408c---36047296018.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/sumagefezixepulezetevurun.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/xepexolamejisipi.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c79388cebf4---borofekotezet.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a381b8f671903703a6b5cf6ecd432b4c/45692437349.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c61ee4b459---vefusi.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/milibexaponowefi.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/fimugugexuxexizemat.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/59047700375.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cae0443c7---selexasowozexela.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/3rpmiiuq5esmq8nhpngo054ud4/94360404742.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/17094272543.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f539d558b98b107657af5e9fea58bb95/tuguwu.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/busurolekefozenop.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/58766653351.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/24907376032.pdfIn PDF document text
    • http://erpos.sk/data/files/pagolusidekigixiveligamef.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/jakijuworanopuj.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c55348265a4ab467be846af4a2fa5aa9/xijutedemixoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=macbeth+act+1+scene+3+summary+sparknotesPDF 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_off000111ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 16820 bytes
SHA-256: 863b9cb78af9ad8e617528166780bba770b36672a5326c1a00a41e61d6c82a66
font_01_sfnt_off00013d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D94 11164 bytes
SHA-256: ac26e25ae058191ed9e0daa3bd7d3dee61cd77f6e91dba59ac31fcd33dc1cc5e
font_02_sfnt_off00015770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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