Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a3685794baefad…

MALICIOUS

PDF

75.2 KB Created: 2021-08-30 15:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea2066913e5a21c4a5a5949ba9ddef1a SHA-1: ca6cb86a135f11c7b758bba710ff296fd4a70c3d SHA-256: 52a3685794baefaddd7b8c8d6b3b0547cf2ec753318c36d987a5d1e99e4e8e82
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's structure and numerous external links suggest an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://waypl.pl/upload/File/kupasedax.pdf In PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9625bf259c---18538368469.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219e6f36686---fatare.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210702073621137.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/votiluromituponesakisoge.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/pipebolanepefumijozometej.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16212609743296.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/depikor.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/31743118478.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/38898825138.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/76160996937.pdfIn PDF document text
    • http://vucert.vn/uploads/files/32042204561.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a93e21e79---47431833195.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6eae631b0b4df6ca51eb20930b4d2bfa/42323040138.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/betetuwakuboxebok.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-04/images/files/18145931049.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/61837350743.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/tibirovinowelo.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/79409128335.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/katavenivewi.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/vujimiwu.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/504a6b3d520fd1a33e637e90e0eb2693/64842760873.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1524b97397e3bffec8568a471555ca99/zixez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+minecraft+on+a+macbook+airPDF 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_off0000c2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 16480 bytes
SHA-256: 69c68b2f548263e3c063924bc4a1ac0f92902012e023c329e9be240d84952977
font_02_sfnt_off00010555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 10772 bytes
SHA-256: efe6310caca0dc1ec51a7170cafe5788195774fd7880765691c6a8bfb61248b4

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