Malicious PDF — malware analysis report

Static analysis result for SHA-256 7684ba5a4604b031…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 07:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 343cd35c7cf554a53ad3c9db324cdbdd SHA-1: d56106a356fe3e39b0c90055764aa076565178b2 SHA-256: 7684ba5a4604b031179b21fcd0215696e59d12196604c40a142213691ffb7259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload storage and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content hosted on these sites.

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://inarsindbari.org/uploads/rotawokademobafoto.pdf In PDF document text
    • http://dexgerm.com/data/file/userfiles/files/21613584104.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/93773287757.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/21716469824.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161385f970595a---59386575819.pdfIn PDF document text
    • http://belean.pl/userfiles/file/63416175620.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ddaa6890c---25901109519.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/23923630537.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/wesojebomaluxeluluwovo.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/1538386416.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/675920d25252d8f65793f1f54be91b7f/93219637664.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/zunofi.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/14886989216.pdfIn PDF document text
    • http://zeci.nl/im/image/36701830608.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/392dc35cc1e6aaa4e616b72f2595180a/lifeku.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/maxekiwugex.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/46a34fbd9442f4f5b714aa4ac11a33b8/fobomog.pdfIn PDF document text
    • https://ekransamara.ru/files/77591876476.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/99869075261.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/73064570446.pdfIn PDF document text
    • http://origo.ws/userfiles/file/bavazolakemowufofifizewo.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/moduw.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161401b21bbc46---totekovujej.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/4388095415.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/wokusewor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=kite+parallel+sidesPDF 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_off0000d54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54D 18124 bytes
SHA-256: ae468d3c17b741c611e8af52b497e1fd9c35b07289016927ab867b1cf45c42a7
font_01_sfnt_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 10152 bytes
SHA-256: 5f619c09a65748ed9f3cd05ba6d56ea88f90192aa58a8601d03bd52e9fa9717c
font_02_sfnt_off00011b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1