Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0bd3cc735409b5a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-04 16:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b8bebc48f88e863fea239cd430504328 SHA-1: 8ac9fc2737f8261e1c366f13b891c8e595ab0b74 SHA-256: e0bd3cc735409b5a076cd300804da1d24d89f843539e4bcc4d9e5c2813e9ed7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=raven+escala+general+pdf PDF link annotation
    • http://apnschool.in/singhania/downloads/file/87056466085.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a23c14fbe8312ce7d2ee6162bd75fc7f/48806922338.pdfIn PDF document text
    • https://webmenuplus.com/images/file/2538402184.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/38469984368.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/94592430847.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722cae96a0c---29721110649.pdfIn PDF document text
    • https://badoza.net/userfiles/file/jesisekexofonaluwakeket.pdfIn PDF document text
    • http://salkim.com/userfiles/file/jufalodo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a12fd800790---wimiragebexigediwolop.pdfIn PDF document text
    • http://zxsolar.com/d/files/44557650983.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/luzobuwudegupovez.pdfIn PDF document text
    • http://mousike.it/img_ins/files/temuvise.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/falavajujalu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/4d4ffe628252666ac506d47780da39fe/mawilaxifojojuxuluxiwi.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/55621540119.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8622617b8---5464258144.pdfIn PDF document text
    • http://ancheng-medical.com//uploadfile/files/4358926985.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/8fcdf7e7154fedf6c1f9da805da79a3b/90535947964.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/08/25/81168621605.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608607ac91714---60740284338.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210802_012118.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/kowipegut.pdfIn PDF document text
    • 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_off0000b982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB982 10596 bytes
SHA-256: 38bf8444ad635ad73a782bbdbd170da34c504d0739640834a38bace706238048
font_01_sfnt_off0000d1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A8 16524 bytes
SHA-256: d863f2e7b318f27e95e813bb8217d826642c6ac7f5e74e83041847beff9efe1e
font_02_sfnt_off0000fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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