Malicious PDF — malware analysis report

Static analysis result for SHA-256 53afaba9e43755df…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 05:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6e3dc652020e5cb481d5e1c6b9bcc986 SHA-1: 57fd1f192c3679f5408e24e3b05ac7377b42c931 SHA-256: 53afaba9e43755dfbec5db12ef595e0c0c51340daffc30fcd5791be7438e453d
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or trojan delivery mechanism. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, likely intended to obscure the true malicious destination. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may also attempt to trick users into revealing sensitive recovery information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://viquadro.com/userfiles/files/27483856291.pdf In PDF document text
    • http://marklaliberte.com/fckupload/file/gimobulusaxawesirifulo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132e54a996d4---vagiwifunisesinab.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/95393754335.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b65cb6af52---zonavulugepi.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/nejomofuniz.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/zamavinisat.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/68326775405.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15ecefad0---23347619776.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/debemaxiwor.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/70976855464.pdfIn PDF document text
    • https://pbanerjeeservices.4digitmagic.com/userfiles/file/lanifulobitejutinusudak.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/guvunud.pdfIn PDF document text
    • http://mobiliteit.nu/files/7475044608.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/71930785245.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/79631027402.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/96986136228.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130cede0abe2---nasivulolevuzawi.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/48842383960.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/pudawiririwivepiwi.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/86667912451.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/462b3fbed618a99afe0b0aab135b755d/387418411.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/ripesaporelegup.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/xunonojufipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=picsart+video+editor+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_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 17988 bytes
SHA-256: f9e69122c81eb32164fb05b51f1004b7383e9a87487efeca7c25b315839d18a5
font_01_sfnt_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 10516 bytes
SHA-256: b2e5f6860e15c4b3c605273744fb0d7e8164ac4b9767c9a15d5c7d34040e81d8
font_02_sfnt_off00012e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1