Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb90f2814dd3fd8…

MALICIOUS

PDF

81.9 KB Created: 2021-10-06 00:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 788603c4b6f78f0a16ecff3359415ac1 SHA-1: 3b50f5411dd70387fafc3960c903f888fcb27225 SHA-256: edb90f2814dd3fd833bb31189be5d51e229b097965a1bbf756ba2d289667966e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites, likely to deliver a second-stage payload. The embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users into downloading and executing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://irths.com/upload_files/files/jesiwagidawutegabupe.pdf In PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/89313584512.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/zuxadiwisojesuxudexete.pdfIn PDF document text
    • http://klhl.com/userfiles/file/setuvidonejupejixibunop.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615ba3320bbfa---jixixodoxevowovetaja.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/91882122293.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f0fddaf95bdf007b8d918ef81322ce4e/24633791254.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/39520579545.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/37537306423.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/ponolamofozumofosuge.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/befirawis.pdfIn PDF document text
    • http://hypovyhody.sk/res/file/47474261490.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/zukoxibu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615369a8f2da6---65871078337.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/89899076000.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/noduzedodabavasijabida.pdfIn PDF document text
    • http://perksys.com/userfiles/file/8010464897.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/37560503304.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109020824386598.pdfIn PDF document text
    • http://bresky.cz/res/file/lojinejuli.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/62390797237.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210926170123.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/89680093205.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/xonenupo.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/83105049896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=distance+time+graph+questions+for+class+9PDF 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_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 19092 bytes
SHA-256: 70668b68ba93cc33bb997dcf0243499dd111dfeb628ce9566cca41c817e04886
font_01_sfnt_off000107b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCF 11340 bytes
SHA-256: 4e71c760fe17d996678df65cade8245cd755f60125196da567d29055272e4c5a

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