Malicious PDF — malware analysis report

Static analysis result for SHA-256 01cf9b83f09e5bb4…

MALICIOUS

PDF

72.7 KB Created: 2021-10-03 06:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b6d904d6881ff5f4a6959ffa131ecb4c SHA-1: 4d1161eeeb79c37482a162bda82febb5ea35d159 SHA-256: 01cf9b83f09e5bb4bfe26127edd1b4b26e8a76a4e04526c81db66a2482db1239
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The presence of embedded JavaScript, flagged by heuristics, suggests potential for malicious actions beyond simple redirection. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://peoplesmodelinternational.com/ckfinder/userfiles/files/10633027861.pdf In PDF document text
    • https://peterdegendt.be/file/56147219314.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j70fehu50g1ihf4hgeb72fkg70/87300625568.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161405d586ef6d---xexusijuzi.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/tenoxuw.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/4196743163.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/garogaj.pdfIn PDF document text
    • http://kahasat.cz/data/file/86085009268.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/sasitoxunalanuwof.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/xavizesolagofowopegitag.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/4247850281.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/6931598409.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/nedefo.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/71642980550.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/xuzifisowaparuzo.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/55841655073.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/vunevowejulima.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/56523553418.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/58252890170.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/80675791474.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/83878050601.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/javajidu.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ikn292kovl4m1pid4r2ot7fj65/mamix.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/rvapl6rbmn8e85nh7tfcvpq8b5/zapogoredojoropid.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52012723954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=opening+song+casino+royalePDF 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_off0000b3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F8 10588 bytes
SHA-256: 248b590137c71d3b06fd3d25d5e477fab241932a5811015264e6ab7d178734ce
font_01_sfnt_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 18872 bytes
SHA-256: c24e30b6effb8a5ea749833c82a397264ddd87967642a2a11d8b6fe4a4712819