Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0171a4302a1d990…

MALICIOUS

PDF

61.4 KB Created: 2021-09-19 16:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c259d2c2899d20706dcbc5a7065c218b SHA-1: b558e23acfec6400e467c86c11c105825a84c501 SHA-256: a0171a4302a1d9902252d3541a45de413663d200bf5a9ca5921070ebfc31e4db
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support the conclusion that this document is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6294

Heuristics 5

  • 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
  • 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://basyapiemlak.com/yukleme_klasoru/userfiles/file/fuguje.pdf In PDF document text
    • https://samajsutra.com/userfiles/files/dubod.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/jukiturawudoputimelepode.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909120458.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/jutob.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/gojit.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/25428983679.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210908015015.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/11020650657.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/mamef.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/divaxosemo.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/fetuxasutiluponumadedame.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/molavijupa.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/zijasukovogijalaw.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7e1880ae---99003961955.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/tirutalogekibijuxasuvunor.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/jobudokunobowavopuzog.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f50cb3b77d---sezez.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/82001862694.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/bojidowewizumorimomavi.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/12618206084.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b1e3283e2c04060fb58918df01ba94bc/ninokowo.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210905_871050657C605CDF.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/bofabajidagiladubilagut.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/58044586174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+store+data+locallyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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