Malicious PDF — malware analysis report

Static analysis result for SHA-256 a496a1e90856fb33…

MALICIOUS

PDF

127.9 KB Created: 2021-09-07 15:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9062ffa23aa8956ead6835ecc201384d SHA-1: 1321a58055fca21bc575eb70025084a0287b524d SHA-256: a496a1e90856fb33a4dd67c1ad04af6b89200e903c13fee3e2ef8edb8cbdc96a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it could be used to exploit vulnerabilities or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://luyenthitoeic.info/userfiles/file/27052737687.pdf In PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d24f1fc42---85308777515.pdfIn PDF document text
    • http://irollee.com/userfiles/file/zipaburakob.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/mijogufap.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9d3b4620c0a18415f4b4592a0450bc1/lixutamujudazafez.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/77230798469.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc78dd30af---sumodose.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/kekepilipax.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a5c1bed772069474683d72b656b2125f/wipodigerufuvu.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/38793901766.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a69c564aa---vazuwipefewatukasowerigu.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/76887829954.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/71957948447.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/87145265692.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/dirivepusopupekadiloboxo.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/52131801889.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f157936a3---68343213014.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a955991eab---6664165083.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe2a082054---vekam.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/zipasogodibonifiwevig.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/59743208039.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/rakizaziti.pdfIn PDF document text
    • http://lscapital.it/images/file/51663398153.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/0fgnik29r3dful1gpj1s6a9s64/82327108859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=paul+the+founder+of+christianity+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18909 21604 bytes
SHA-256: b7509eade98df1348c26222eb86d624d8040e42d054437e17689136ff282157a
font_01_sfnt_off0001c023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D83A 10932 bytes
SHA-256: d3c6338119b891e307d8682bd1d270c3dea1cae0baeb2dd8ba9560018bde0358

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