Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd57a0c861949ee…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 01:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bf1d6f69b8dfda862024c64907fd114 SHA-1: 375a1c3e60342b1ee28e01b6c235b8af2f944ffb SHA-256: bbd57a0c861949ee73985ff94c5bb207b3c4d9a17344e3a7517ba4684b45063c
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://medvor.ru/uplcv?utm_term=how+to+get+contact+name+and+number+in+android PDF link annotation
    • http://studioguagnoni.it/userfiles/files/81379769346.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614901395dac5---36812548178.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/24277524592.pdfIn PDF document text
    • https://sopkambing.com/contents/files/40783860512.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/selolodibowevese.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/gisedukedaxitudaketajafak.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/38272198011.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/rogujatanetore.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/tomijixizuvozasemuleboba.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/74209741868.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b33edb024---90700299142.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/41780193403.pdfIn PDF document text
    • http://ibb-online.ru/f/file/48759951414.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/6143501686.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/32961660462.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/noxupovewubilis.pdfIn PDF document text
    • http://leeandrewdavison.com/download/33598900283.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/nufetuperabubiwera.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/xufevedimoroz.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/wixekiredobigisajer.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/dakedabomimadezapejoduso.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa4f7a9b0---80483297983.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/tarijadipabazubekasese.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_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 10816 bytes
SHA-256: ec9e7ab5dfa1d75bbd939a701bf0a1d2d2101584e70a9b24d7cd6da58f536a2b
font_01_sfnt_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 17648 bytes
SHA-256: 20625246e026183cd69d14f05990b53fde49659b4b4a0002ed450a9188f7c98a

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