Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea7b959b099414f…

MALICIOUS

PDF

95.1 KB Created: 2021-09-23 06:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1ab416d1f8b27951c836ded62d88ee3 SHA-1: 95f95f0e1df4555328587c3bb436e4d01890374e SHA-256: 4ea7b959b099414f2440c6c2c8a243d10bf5bcaa38b8e9acbb17ec3540ab98ba
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://xn--9w3b270a7kf.kr/data/editor/file/42888407180.pdf In PDF document text
    • http://slsnn.ru/content/files/63268547367.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/27259008477.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/konolatokubuzeligomavopir.pdfIn PDF document text
    • http://space-edge.com/upload/files/winipofakagigitidibe.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132c77194f14---toxejuduboxusog.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/38939170219.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/85420934071.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210912_011909.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/60872889769.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/nobawifusev.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/likofakotenejewuvu.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39347340697.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/tulepexawudajafenas.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2e5d4ab84---pusagunufufoz.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/fiwomasutubabajepojevagun.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161442c3dee1fb---kinalirekoforar.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410edf7f48b---13413594621.pdfIn PDF document text
    • https://shidoremicrosys.com/media/desosuwazefugalab.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/58620286835.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/durovamimilaw.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/dopivelazubojikogez.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/47937641052.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/nimilolopelefofefazep.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/94847232768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+recover+password+on+androidPDF 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_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 10604 bytes
SHA-256: b16556f0657b8c0b67a562fa3bc9214790f4384f6504fabc5eec541b8f1e8d34
font_02_sfnt_off00013c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6D 19128 bytes
SHA-256: 4713e4d89177bf2da58407bbd1350146f9e24d5f7a46b0524539ba36b3b05582

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