Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedfbdfcaae70bdf…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 21:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b68e0c2f656121259c63611ad024553e SHA-1: 97e4bb115a71a4bd411fb310e46a31fe35a3e945 SHA-256: bedfbdfcaae70bdf4fc73fe8c5beed1882ca6287ca1b6feae4040abff0f584a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external URLs.

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://cructi.ru/uplcv?utm_term=uplayer+mod+apk PDF link annotation
    • https://sergeca.com.ve/ckfinder/userfiles/files/wapuzidibefajejedeziguf.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0cnth386q3cioa9n0sfhpv5e4c/ruzexajir.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a613e73df---97777058625.pdfIn PDF document text
    • http://gr-chem.com/upload/files/kekiruve.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/71757318741.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/zadififutemazo.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/pozovazajelowazotivemon.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vemerapefimapisunuj.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/xefedekujujevunemomova.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210903_193210.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/59952660949.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/17004291051.pdfIn PDF document text
    • http://kaies.net/upfiles/file/39827475994.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/12751748561.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/volowanowafokizipisukavu.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/fotikanij.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/22761806712.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/43696638627.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/xotelokamawizezelovari.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/begepapoposonije.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/041f7c747d555bc7067fa0daf23792f8/43821463020.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_off0000d355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 18260 bytes
SHA-256: d25de72538fb33485bf5f3da6f59b26719e1abd67a3c554f0664734c3fb1c469
font_02_sfnt_off00011ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 10304 bytes
SHA-256: f895b66c7c3088731e6f3970f2c5c2879985b054d286ac6c8c94b65b11faa286