Malicious PDF — malware analysis report

Static analysis result for SHA-256 b089e21ed91a6efb…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 06:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77c0803559cd417687d4bcdccfb95ff2 SHA-1: 4d0d58a641d4fbc347131b3322317f8800aba304 SHA-256: b089e21ed91a6efb39f388945489aa76442add043f525fbb90ed7e87f44cbf43
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://diagnosticaedilizia.com/userfiles/files/tixuzasotiravirofikon.pdf In PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/70961785241.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161031671052e8---waliwumogusofizadirenof.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1t64ap6lkrfnrsv76ifgl5frk3/jiwusolidorosopowero.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/33400962319.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/jigewizukalag.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd89504c315---6591230223.pdfIn PDF document text
    • http://www.moyekolodin.com/files/87122204520.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/94046495552.pdfIn PDF document text
    • http://falerisztika.hu/tmp/35158779872.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/9583547278.pdfIn PDF document text
    • http://24cvety.ru/upload/files/bokejapoxuvakevololop.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/dtarfbpucte2eqafa4mqbg1jlt/xawazewiwumekonididolep.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14ece8f1ee---jowazux.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/45660847389.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/66865253336.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/jomiwepeduvefixelajedaxon.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/pikafamujejodobam.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8b67f895a500eb10132d89216ebfa4c1/nevegefatoxukituvovame.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/vifukimudeniji.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ea12473bc---wibumatafudekena.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/32177067631.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f342c7df3f---57359019901.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609048d613461---71123462247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cgegis+table+december+2018+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55D 16160 bytes
SHA-256: 0de48d09b0091e2dcca1524f119562a2650f4f0070c1ddb91a42211a810a88bd
font_01_sfnt_off0000caea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEA 11412 bytes
SHA-256: 9bb0a1214fbc987378347ed2143fdddbf8adb7254cec7e00789520d86d52a479
font_02_sfnt_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 20436 bytes
SHA-256: 840577752d5b0c1da470d06fd0a6f6f9864a14eaeca4304c82f7fb213ec42b41
font_03_sfnt_off000119dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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