Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6ca6f10a0f1a8d…

MALICIOUS

PDF

79.2 KB Created: 2021-09-15 09:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c3aeff79ea769ab37412513b46682c7 SHA-1: e3660015f8433b278a5c756acc43a8ce60b308c5 SHA-256: 6a6ca6f10a0f1a8da402205823969ece49688f1c37c893728407a8022e6e6f9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also hosts numerous links to external PDFs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xinpayflow.com/ckfinder/userfiles/files/nubavibaxal.pdf In PDF document text
    • https://nmg.lv/img/uploads/files/dotilolajif.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/kepimejajek.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/281768863.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/grmm17k6m240qgul2gai11n2cg/lufimosalana.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/afuvoa3ldg9v75svqojshbsem1/xegebevasew.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304a94b2535---84371743612.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/viwidukedelarisub.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/591fc2f5afa7fa468b6c88574936cb7a/10838043536.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/kizikitenibemalilovedu.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/posabelesegosovatawujo.pdfIn PDF document text
    • http://1carl.com/userfiles/file/40612355638.pdfIn PDF document text
    • http://marketingnews.fr/images/file/10053525869.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/49361820293.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/waxotozagixulex.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/19930296975.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/57593467462.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413bc57383a---jevudavajirukibisibex.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/95556229769.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/rowizapedimulovi.pdfIn PDF document text
    • http://bubb.cn/up_file/file/83360691524.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4996f403085d1a08196b69a45f4b3757/wopetugudixeluju.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/5544110302.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab723bf932---bidozabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=piano+tiles+2+installPDF 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_off0000d56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56D 10124 bytes
SHA-256: 581c27d328f7cabec74fc09299989c644c591e721d013bcf4e46b089ef4b2ac2
font_01_sfnt_off0000ec36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 16788 bytes
SHA-256: 4a5171258562289e464874767c5be3210c1a8f4ff9d13b7a6af1ce41aea5dcd4

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