Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd16e9e27f564db…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 09:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53dad1f5c2a3fef556ea4dbf1bb5390c SHA-1: 119e6d04d3b1506c9c942a79e56d8d7eee4a4a98 SHA-256: fbd16e9e27f564dba6f32ee5d6e6334cc43a6a7d950999f7e56ef4da3b9d3b85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates redirection to these malicious sites, aiming to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=tamil+mobile+movies+website PDF link annotation
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/nezizalamubof.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/dilomupu.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/zajilusebavasetof.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/14371099659.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/57748476650.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff7638f145---82074284849.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/l4rtibjh5ilp34t5crmfrfujl4/judanegiwopij.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/35243925135.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161433601e9ff5---xowixevurepe.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/lubulavogujavunolekerusum.pdfIn PDF document text
    • http://inphilong.com/upload/files/57354658043.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/fetefiso.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/28734313388.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/silife.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/228631920.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/gajuq3df5ntnbq0ivop9patnqh/tazerimubidajatevis.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/eq5ers96153sfatdopi3k3dfcj/92269825407.pdfIn PDF document text
    • http://poorclarescork.ie/images/mosorer.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161469469a7f7f---zaxolujofifilegowaviri.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/68634861854.pdfIn PDF document text
    • http://platcometals.com/images/file/99738841294.pdfIn PDF document text
    • http://www.bash.cl/media/file/42940389153.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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 10320 bytes
SHA-256: 7bd741d853d2b7f41e048a61a98c5fef43b4c30908ba2725fc3764064798d58d
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 16904 bytes
SHA-256: 0fbac8261e7a6f4918f087299546be47df0fe1e9241e7007c486881e5edcdc26
font_02_sfnt_off000125f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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