Malicious PDF — malware analysis report

Static analysis result for SHA-256 a658cca80fdcf3de…

MALICIOUS

PDF

73.0 KB Created: 2021-09-03 00:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 89216515e259186245200e2184d9d659 SHA-1: 3340de3529f7869180a8e6559152c7123458081a SHA-256: a658cca80fdcf3de28c156e78967a753d735f63d2e87159c771b5e07a87d4ca7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://chcial.ru/uplcv?utm_term=fidic+client%2Fconsultant+model+services+agreement+1998+pdf PDF link annotation
    • http://cuacongtudongbinhduong.com/upload/files/35593164737.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/taxubisesew.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/pebemixaxuxasagezonikod.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/ramuxevogotuzepisiwimixu.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/pivewufodinuleso.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/11034303503.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/bukasun.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e00298b268ab77287c693e949c367176/molileba.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/icnf965frtlq6mgi0s04akgukt/9647845532.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///71344892864.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0c4055cdf---79821475955.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb81633cda---betubonifuzakigexifejul.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1dc77daf---titedubutuvuneru.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c04bd54ea---96585784552.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab37499d0be---28131783053.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/14541207015.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/3f41adf641099e348455406628f64071/56246050198.pdfIn PDF document text
    • https://dintek.eu/uploads/file/45694634407.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/xenarujibipabalivaku.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/jufaju.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/5460448410.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/95154906951.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/51241757252.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/4799014744.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_off0000ba3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3B 15780 bytes
SHA-256: 36e0ce4562151072e0ba5cf4a73da68a1d4b80b80b5516d31b5e60ff0c110991
font_01_sfnt_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 11568 bytes
SHA-256: 438212b634f4586d9c0429ce169785f2253e5a174bb72658fef0562956e796b8
font_02_sfnt_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1