Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3bd3393276bba8…

MALICIOUS

PDF

89.8 KB Created: 2021-07-01 22:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2e65a44a211896397b73502e7086bfb0 SHA-1: b97d6521a5ba3b0664fd374a2a4a34d351e01c7b SHA-256: 5d3bd3393276bba8beb5e0c9f75f3ddb99b20d431775cf3ec4153b088b0ff9a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of multiple link farm heuristics suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://ldbell1965.net/clients/85689/File/zilunabatono.pdf In PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/rugulakeg.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/48810102340.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/12429011771.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1b14a796e8fb663ddb3ef18f05db067c/67391285740.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16097a86ba3647---51967761603.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/fokozupix.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b5626a87fdb---26899447047.pdfIn PDF document text
    • http://ministerium.pt/files/motumogoborobuka.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2f2b14a0---54884113300.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/bafiwadagopifozaje.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/l04637f2ktptg7k7hptn5pfphc/96607400071.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b409d1ce979---5294666330.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/pekevipekuvukotut.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16094d2259b16f---sagakimire.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/96093068691.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/24116874103.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/bepajazaruzat.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a85b5a55924---tojuvidekezeragokatude.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/xadatafudakafilatat.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/36a88ceda6a301fffbddd01c909003e7/13696025595.pdfIn PDF document text
    • https://aedwea.com/upload/foto/27079859851.pdfIn PDF document text
    • https://turbooto.vn/upload/files/dojoxuxofanilugiseref.pdfIn PDF document text
    • https://giasutainha24h.com/upload/files/lamotixiwuzab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+access+pdf+on+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 10644 bytes
SHA-256: cea401c9f6f1e92eb0e9e41174127a66c5823bc4e55f71f969999196ebda0993
font_01_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 16304 bytes
SHA-256: 72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee
font_02_sfnt_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAB 16852 bytes
SHA-256: 189cbd87b5bbe94f8fc8efc57b38d5b552298ef4961db91ce6ea991b48cbc8d7

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