Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e2c9354282a8fb…

MALICIOUS

PDF

70.9 KB Created: 2021-09-12 15:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e2c8bd361f5d06cad30c37a1f38c998 SHA-1: c05e829ff45c83b894211e124c8602306d8ba084 SHA-256: 43e2c9354282a8fbdf36d1e56f63ba142caf0ec318d847dd393e18d7ef7f4f77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • 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://worldmedglobal.com/userfiles/files/ronowisasapuka.pdf In PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/xiwokoj.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/95226943593.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/68925107149.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ff43512d6---59152516241.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef335b2f68---44984650358.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/sizidojalemovip.pdfIn PDF document text
    • https://pepsima.biz/files/file/ravakutorose.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/begobomegadodedowo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd13b5bb0---warimiborowizagebud.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/15998455713.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/bowebapijodunorazegiret.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/xalilitivewerulevisufuzas.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/7cf6c5c4193fa1704eabbd61a9944cb3/55670950440.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/vifuzutiwajozarotaw.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ku6g6m59a0k2ua516jel7vhvc2/vibajowu.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/wedekopiwe.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/talovimade.pdfIn PDF document text
    • http://come2menorca.com/images/file/20003700801.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333b4fa64a9---79613219758.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/semuvozinadojikejel.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/xarup.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/lotosomutatukenomuguxekuk.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16134afc4d9ab1---52536511385.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/29296343651.pdfIn PDF document text
    • https://kimcert.com/E/file/10998719653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=smart+ir+remote+apk+downloadPDF 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_off0000b2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EC 16328 bytes
SHA-256: a10982842ad36fa190e3e29dc01611c2198be8ea5cd55d0dbbb0429efcf3642d
font_01_sfnt_off0000dc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 10640 bytes
SHA-256: 035cf5a54abad16e3680ca818e5dd732de6fcf8027972e6a02ba6c0fdc7713a6

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