Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09e6fa3ffc973d8…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 06:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1acd9f9bd62d1715985c8c8fe43637cf SHA-1: 3ec99e39ceb0045596b97d55ccaf9f79b3563895 SHA-256: c09e6fa3ffc973d82509aa8d8d04cf159972aea7fca5ae8eb85b1baf100e277d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://xn--80ag1a2a.xn--p1ai/files/file/galilidajumite.pdf In PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/54970467875.pdfIn PDF document text
    • https://paperland.bg/uploads/file/34333360053.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/nukezotonixugopam.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210925101705.pdfIn PDF document text
    • https://tarsiman.ee/files/file/3175993509.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sunedozekevadujafod.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/18932763838.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/86703886132.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/wopogo.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/xabexalamabomotezebojodo.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/kulvt2tvo6ia5hvit0k1v276mv/87721097989.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/marufado.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/sexakik.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/fudivezatufepixipokozal.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3f5e9d58ac27f041bb05087b1ca1012d/wimuvowafulu.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/50705092425.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/94984149459.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/29118273414.pdfIn PDF document text
    • http://119pump.net/d/files/serigur.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/migilaropumew.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614209c078768---96075495646.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/36109576268.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/14997728511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=amazon+fire+stick+custom+romPDF 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_off0000b2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACD 15232 bytes
SHA-256: 0e1a445a7e76667f69c3811d3326a7702d0f16f8af730d25d999e8286ddb87f7
font_02_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 10684 bytes
SHA-256: 4fe4b2a5f1d9d023d51d45c170833f1d9d0d31602f7da46be279af500f5be077