Malicious PDF — malware analysis report

Static analysis result for SHA-256 6353e432f7d3c408…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 15:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57d7b07523f5d2e9b5973fecc3786872 SHA-1: 51ee9eb111ffd64c1eddde259fd985f9b890166b SHA-256: 6353e432f7d3c4080be0b343eccbf128c875e27bb50d22c6f7cd62a386f92548
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://allytemp.ru/uplcv?utm_term=rush+royale+mod+apk+download PDF link annotation
    • http://gtlmarinefuel.com/userfiles/file/mojakuxivotozar.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/40791256660.pdfIn PDF document text
    • https://pecsikult.hu/files/file/53397170452.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d4fd6625685006211e46818d993fc2e8/bipoxipisewema.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161451f114355f---26434761161.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/efee8718fdbffea0f82f0cea89962c1b/98701715524.pdfIn PDF document text
    • https://bak.vn/upload/files/14964952133.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/kugudepewokapo.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/52966876335.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/pekukugema.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/tikujodepijududelebig.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135085820905---jolugevedupalasaregeraw.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/kajutigofutigovex.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/91950180624.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/neradutegopi.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109031145155856.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/dinilapeno.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/wewamum.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/76122087845.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/lifanawuvuzimatedexivu.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/41630232626.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/94942334730.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/3563317932.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/mabejilimafazilodimizu.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_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 17280 bytes
SHA-256: b63e3fae2e4d98aa1573e58d7850233a2762a9558afb31934b8e233b499ce3e2
font_01_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 10904 bytes
SHA-256: 951d12af943691df33edb1072c7c28bdaf74b7c0df815a5e61a4b7af7b9b79ca
font_02_sfnt_off0001204d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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