Malicious PDF — malware analysis report

Static analysis result for SHA-256 705c7f588e1f8693…

MALICIOUS

PDF

86.5 KB Created: 2021-08-20 19:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ddff8c0bc11d3e2a0cda7866fba45b3d SHA-1: 01d242c4e0107b4cd0e7074bfb88034a3ce4b820 SHA-256: 705c7f588e1f86934a7d90c4a9c24f5f9e2f3defc7e2914dfe9da36a0f455733
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm, directing users to various websites that host other PDF files. These linked files are likely part of a phishing or malware distribution scheme, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics. The presence of embedded URLs and the structure of the document suggest an attempt to lure users into downloading further malicious content or visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cinstech-inspect-survey.com/fckeditor_userfiles/file/42610942489.pdf In PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160989c1bb5f1a---12045738944.pdfIn PDF document text
    • http://a899.net/userfiles/file/79152553440.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/19584875082.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/35a30ed5a1d6d85d4966afaabd8d7bc9/94546225041.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608059331df9c---nipadunulefefe.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/gaxegedovuboxolomakojax.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/78256518848.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/falusakapodu.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/1b45434ee0c4a91b340e66ad275a130a/77117133014.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/72960934334.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/72926227385.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/sofazazepozu.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/vasapisifulove.pdfIn PDF document text
    • http://aroma--style.net/files/files/6415642704.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1793f28fb3a3878e9243f3e747782c26/68901121596.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b45e5961d4e---zufurisi.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/54040025583.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd77baa28b---97971950063.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///fasogibob.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/76731680093.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/danulufarakelowimizib.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/mifije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mini+militia+mod+apk+unlimited+money+and+cash+old+version+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_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 16768 bytes
SHA-256: afd09ccd7785f0842e44a50d034454a299c3f537062058f7f8cf8ed1d3e01c8b
font_01_sfnt_off0001188b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A2 11232 bytes
SHA-256: 0547620732814ae323454a4181784d17f3fb6d9a998daedabd2451ad18e1a3c2

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