Malicious PDF — malware analysis report

Static analysis result for SHA-256 267dcc82a621868c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 08:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1e541a669c611dddb3430c114ee70f7 SHA-1: de7f43d39115286e7fc2c78d307ced221b051ec0 SHA-256: 267dcc82a621868c0c2a2e110fbe6da7e203e7711817cfa62961ffc0cca64e05
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pmfegypt.com/userfiles/files/88895377144.pdf In PDF document text
    • http://hollywoodterrace.org/clients/863344/File/96467677613.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/0f1vh8bumll4f4mkvdk9pc9btp/50299173831.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/11138307986.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021081212533477.pdfIn PDF document text
    • http://artospace.com/pics/file/7559041774.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/lakumitoguremudezixejijak.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/42535499614.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/nadevijatibaxe.pdfIn PDF document text
    • https://alutat.com/data/file/luvanaxeposaruwoxemuko.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b541305a899---85351515350.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021052108175473499.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/7728623843.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fmljrdbsaop7kfbjdbj7mvssm3/zareg.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc5827b18---zavifutebukukizeduvofe.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ea07bddd1082cdf6af1d8e46576982d5/xexuwepojuz.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f7c02b68ad3f97428d2306b73eade8ba/78108266990.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/kumojuzurelurawojuxuzon.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/nizusutaxafafesifoweforat.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/kedaxojebevajogedexivi.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/39369914679.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5630fd5f90---vidupuzeduguvojujakom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=finite+element+analysis+previous+year+question+papers+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_off0000d518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 18440 bytes
SHA-256: 0e87a9a4e86a712dec795e8c049b3adb95d6733f903fad808086fb62a0ae0341
font_02_sfnt_off00011d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0E 11064 bytes
SHA-256: 06e12d3d5d8c84f2616c94538198ca72c55cfc26c8d1d97d393b421f35f47811

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