Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59b1e9567e4dfb8…

MALICIOUS

PDF

130.1 KB Created: 2021-09-06 20:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 43185bc4f95d20f404cdf65c2c3ec91b SHA-1: c94b93d92c0ff174657adecee2004009e61ba70b SHA-256: b59b1e9567e4dfb84aa705f245cad789184fa9cacca31a41ce45585096f9040e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://koryosushi.com/uploads/files/26725971747.pdf In PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/le89ion29bf1a4qvgih3rcc6c7/pafudifipidomososaromo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b666aebbcfa---68859542476.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/e5062e4f150a741f3b8bcf6cb45d6a4d/ropowuxakojekinaxaje.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/rijoxejobosinazaxutata.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7b7e18539---nozizaxururazunulax.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/romiredewejugi.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/gojirisiwo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ff30dc48b.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/negovenabimafoz.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/o5qkhmsr4eugmd2dndh7ldka71/21725685566.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/55725042403.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/3717320691.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/mamilinitunogagubodine.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/vimagitebimekesu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83a9064d7b---90730558688.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/xakezafi.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/kipupililajonejoxipixuseg.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/laraseboxebadoda.pdfIn PDF document text
    • https://grancom.by/upload/docs/90079409118.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072a5954eb8e---gurumomodaxezurafemexi.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/45071832260.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/3766052839.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/15084236788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=billardtisch+selber+bauen+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_off00018e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E28 23552 bytes
SHA-256: 60eb8ccef28fd79652c8c14fa16aebb1a4b4e8117d957f3e65d6cabf4e76348a
font_01_sfnt_off0001c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C927 10892 bytes
SHA-256: ea6216099a9561ff23ed25c1a6473649e12c1b66b60de7aea8612ada5fb606bd
font_02_sfnt_off0001e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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