Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e5f554fb022d3f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 03:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0753c69d5f8eed5fbd1eae27f54bf6e SHA-1: fbfae42124cab7ebee62d3a67a5cea7ddf9ad252 SHA-256: f2e5f554fb022d3f8de382f1886893aa8650b4ad5c1a217f44a676c9b107e34e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, specifically as a phishing trojan. The presence of multiple links to potentially malicious content suggests an attempt to redirect the user to a site for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b8f4d0a3---tuketezifop.pdf In PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c838236a5ead67aab974604150cd2101/38719650810.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/44869065556.pdfIn PDF document text
    • http://tiquital.com/documentos/file/58329886722.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/dedekagevupuseva.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/safivasatuxunetawoboja.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/f6apvjgekuq7i0e568l209n9i0/dabenenuzewivo.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106220134223712.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/wefas.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8ud5hfvra73405rvjdjfrqb045/67819530375.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ae983dba4---meviwi.pdfIn PDF document text
    • https://krusomying.com/data/file/ketawi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078df0d46752---67208172069.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607121a020670---zonepofi.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210709094601_ng2tzu.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082eddb1e4d8---53085659371.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/dimuralavulufilefepivaki.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/kapoturuxeze.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/29943128920.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/2cb7ab2bf15a61cef89d2d9180dfbbff/97463721452.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0314152068---votibepolamogigux.pdfIn PDF document text
    • https://diphong.com/uploads/toroketunozeputexoza.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e6754d204---67510824358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=trumpet+jazz+sheet+music+pdfPDF 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_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 10868 bytes
SHA-256: d0f117e6b03c8a39c01e448c998dca4abe9a240bf4b263326a727f586f42c687
font_01_sfnt_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 18008 bytes
SHA-256: ee19f60496445a5f4102a36a3ed2e8e03ce8a4eced3113e3a6a5e40c7f2fe38c
font_02_sfnt_off000129ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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