Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a80e28f46098ea…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 17:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3df76c6bd6379e006de7727a8ffcc7ef SHA-1: ccd805f50e33d0316af38066ee3f36fe617c1d91 SHA-256: 93a80e28f46098eab9f706cd2dcda9a9b7a8e03e6fa0ed7adb3da4dabd6c541f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the presence of numerous external links indicates a high likelihood of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://giridhareye.org/ckfinder/userfiles/files/6801304772.pdf In PDF document text
    • http://berbun.com/user_img/file/60141097316.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/zomesebifefuwepazoderus.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/36977679692.pdfIn PDF document text
    • http://lachina.cn/upload/file/ganonaxemobesim.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c97bde2067---70036601482.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/xefikonafewatabememesi.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dead66792f---1519023798.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/e92qm9pjkd4oq59vnuspgbc0b2/85572101017.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161385331cb7cb---sumipixukexiwisijize.pdfIn PDF document text
    • https://ags-car.com/upload/files/83860402404.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/96762106218.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/rerasaxivoz.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/dojujazakexoparo.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/44491568896.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/bikunetonowofig.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7035624570.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/42673100192.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/zoximesur.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/4f5e1f75a23acd597f264d869cf96dd5/bikekomakazekepanunogif.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/48006546269.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/74276031013.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/gazojogedonepagif.pdfIn PDF document text
    • http://suurelepa.ee/data/file/molatujufajurunabibezuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=adding+trusted+device+androidPDF 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_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 17764 bytes
SHA-256: 9c0b51fd3fa6c71e21b987df98f131f13229bc1bc6f052d16e5961f20ca01256
font_01_sfnt_off00010d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D42 10648 bytes
SHA-256: e7b75025ebe55a6f37935e3936e9c83e730476dd19f083d954bf96c5150b3633
font_02_sfnt_off000125a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1