Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc9831187e8b352…

MALICIOUS

PDF

75.4 KB Created: 2021-09-20 22:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa77d68ae7b35ca1a230335ba1ea7acd SHA-1: 5b4858b25994299289f7f9541b6ebc5e4a706722 SHA-256: fcc9831187e8b35248e16abe417afbb646e5555b5b98cf29b8a20bb3bc83a03f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file 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 multiple URLs pointing to compromised CMS upload directories. These links likely serve as lures to direct users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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 http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7c674761d---zuwodudit.pdf In PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613de2cd3c62c---rafozimitefadexojekalede.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/66107599572.pdfIn PDF document text
    • http://stevis.cz/files/file/58154899667.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109051457256984.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/wevigazapiwuravuzave.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5197e1b0---53824999451.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/nuvove.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/xakekanowaju.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/63884813112.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec43387425---kilekejobogikasijuferemi.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/30349591998.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210905131239.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/3044673199.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/33149972747.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/xebovonoditubu.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/62552772301.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/ruzokijebaluru.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b311e977c17509cdd6e6103298acbe75/27945421797.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/72987488183.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/58134171781.pdfIn PDF document text
    • http://sb-78.ru/files/file/83927500156.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/21773286617.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/fifana.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/nifalaxo.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/14913703400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=stunningly+beautiful+in+spanishPDF 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_off0000bfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDD 18276 bytes
SHA-256: e912a7376348e4bb625c53bab2fb4144cc14d5397a6751329f91aa547007d201
font_01_sfnt_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 10844 bytes
SHA-256: 17b15a108dc17ac7fc38d3b458a76b0079d26eb91299a6ba68501ceb856afc97

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