Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ae109f28b0acdc…

MALICIOUS

PDF

104.0 KB Created: 2021-07-07 06:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 81912eaa7e7e3a6eaaebf6ee0f1a4ea2 SHA-1: b00256ad18f33ce50d02fd8598eaf1071bcd2bd1 SHA-256: 55ae109f28b0acdc715db9263bb5871cfba5296c088402e5bf25ed82a18a595f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, numerous URLs were extracted, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 http://thesecurityguardunion.ca/userfiles/files/61199359479.pdf In PDF document text
    • http://bobmeetin.com/media/galleries/files/84161824815.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/loditivinima.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/f9d49183b0358ca2040d744bf64be3bc/54942900187.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/2vtbl9012m5g1dl8pe65sd0jc3/tisige.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4c128724---judita.pdfIn PDF document text
    • http://keacg.com/upload/files/75639619768.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9cq5t9ke1hdamur7jrho4hg3vk/73444847713.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160867e3596c8f---guvup.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/60573933831.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8586477398---vedurotiwagimemuxisowaxo.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/17446512266.pdfIn PDF document text
    • http://www.toptehnik.si/images/55700332071.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9c17408f72508e380f81dd1bdc0aac13/nazujepulubiminana.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/67952610891.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/zepawulogop.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/26308295957.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a758de5c28b---gowoduroti.pdfIn PDF document text
    • http://changdahk.com/upload/puzerubukevasapixagi.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa579857f---1701260503.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/5dbd76b9ef8ec72847ceee23edc63f16/5528270417.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/8gd8onklldganu2loja6fljs66/89390007296.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56e0d16f5---78193758794.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0084ca6c98---73415842672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=small+sided+games+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_off0001191e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191E 10492 bytes
SHA-256: 73a871259b887756dece2cf7c133430a3e6fd9edb1b11c7cd612d271e244a536
font_01_sfnt_off000130b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C7 19172 bytes
SHA-256: ceaf5935bd7df2c7c1d62d9b6d119c53916b2bf1a2395dcf95d28bcdd8878a55
font_03_sfnt_off00017989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17989 18368 bytes
SHA-256: 473d3cadbb569ec6ae8969898f9ff106455da938e1396d2c4989e5c2832880cc

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