Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f50ecc504c863b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 18:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e14e055e794605d7b1a8a96d097f2bca SHA-1: cac15c13f0e864a1194dabe1d493e78147f9efb7 SHA-256: 93f50ecc504c863bb008e06bf6ffba90c287bb9c8271424654ef71f5d88c0bbe
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external links. Several heuristics indicate these links point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=accost+in+a+sentence PDF link annotation
    • http://konakelektrik.com/userfiles/file/bodapinumakugisukonomafit.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/48134624451.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/92014433005.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/milewaromotazupiwevirika.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/notepomatizerogotal.pdfIn PDF document text
    • https://dalba.net/other_files/File/fexixobilutusarawalawux.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/moep6vg140277o0aclcqqp95el/29216759439.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c2aac90be1b600c88ce0cd0b5b3797a0/tavuriviji.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/25859956441.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/90777572585.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/lijisabepalefopesupamogu.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/miwerapus.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/52368827587.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/miwoxatenajawimivewi.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/76285705773.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429e7279a6a---pepavolupunamenesorumasap.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/gotera.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/naxaforu.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/2477976595.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/zekevu.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/babudekivizakifivowefan.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/ranimojukemekexofiwibimoj.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_off0000d4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 18268 bytes
SHA-256: 8bdbd23a3359e27ce4eef2313150a58796069dd365c41990dd14eba5d266a312
font_01_sfnt_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 10056 bytes
SHA-256: 066c40616b36d4f6050c3fd0bd8209acf71e16f61713698c006a823efacaef64
font_02_sfnt_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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