Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb33fa202e73d177…

MALICIOUS

PDF

68.1 KB Created: 2021-09-17 14:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9573d899529ab9afdc10d9a8947076dd SHA-1: cbec001cd2a575b199cbf244480a37b25306375b SHA-256: eb33fa202e73d17722537da50849a5126e40cbb358fc39b7f6177f878b6cf800
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to trick users into clicking. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm used to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://chief-moving.com/editor_upload/file/6129142588.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/1pqib5bjr3jtsh0ra3hav511dp/309675465.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/bodafigasosupovi.pdfIn PDF document text
    • https://vpmemorial.net/images/file/90396967960.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/59106992872.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/jifisosijegujifesuwomex.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60383989670.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/vusedovebabedepit.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/93318041122.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c31aef4d65e0753886c199099e868094/88876996081.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/belozivorenegunewotit.pdfIn PDF document text
    • http://agro-partner.com/Image/files/kosonefebuxinimojedinale.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/13993347942.pdfIn PDF document text
    • https://digireg.si/upload/tubapag.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/ronedixipis.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/99155470195.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/78634229454.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20998498631.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/39802066838.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a5960f281d4a661bec8d876cc691e796/54877155924.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/lelotiketo.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/bb5ac0be9404fecfe6cb8f437238fa85/navudinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=hill+climb+racing+2+upgrade+guidePDF 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_off0000b08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08A 13876 bytes
SHA-256: 7b408a65e759b18fbc909e140695f93ec061dbed8335945404c1f0500c2cb182
font_01_sfnt_off0000d275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 10820 bytes
SHA-256: d265803b4a26db9b3e5559e74326c679b82067a800dadfcf97d6eb5a0c61ef0f

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