Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e0ff355b549f88…

MALICIOUS

PDF

95.7 KB Created: 2021-07-07 06:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 650847796ac9bec9290bfac822968a14 SHA-1: 6cade957e5e76fc8d8c643e511e5b07efa735d3d SHA-256: a4e0ff355b549f8883eb977fa620a07d920a934af4165fab12b341330cf37fb8
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'. Static analysis revealed embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of numerous external URIs, many pointing to compromised CMS uploads and link farms, further indicates a phishing or malware distribution attempt. The sample likely attempts to lure users into clicking links that download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4839

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.
  • 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
  • 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://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_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

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