Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9dbbc45129fc12f…

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 00:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 945dc6a4f8c2135280320c5fbddb5805 SHA-1: aa1f187bba8cb37819277ee56d746295cb152c87 SHA-256: f9dbbc45129fc12ff915e4e707594c1d6d4f8d9da5f410b8d4e3b572be73024d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of these links and the overall structure indicate an attempt to trick users into visiting potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://wastran.ru/uplcv?utm_term=david+oath+of+the+horatii PDF link annotation
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e9bd395e---92223968704.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/kizakelutibufidazunuku.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f699748ff0---sakolejezevekaru.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/nilijapexofew.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/80830725902.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/6759141147.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5fdde83fac8e2134d706c6899eed8aa4/38802452886.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c538c45874a---sedubujip.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/loxatitelofodibisat.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096dc71efefd---sunoraladoretu.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/datupebaruninebilataw.pdfIn PDF document text
    • https://schmitz.cz/res/file/87506052196.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e13a603169c---73695747052.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/zuxanabaxikorubimi.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3fb4e4610f97c086168321914aed5995/nupejinuvadaw.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210816050747.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf78f39f3d7---28701795377.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/nebawadezopu.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/banulasobevujubibupevo.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/9cb9098e8c6357bf46fa92a56715def9/83117259833.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/29860984527.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743d6d1b402---xaseju.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/28119905535.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_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 19232 bytes
SHA-256: 27b76f25ecb2c7a55b448193eed8afc4aac3f83bd952f91ff30652b235821217
font_02_sfnt_off00013d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8F 10200 bytes
SHA-256: 087bedc7b5a3dfe5b85157f9f3b13291b8d2afcac2748001be6fd85735c92579

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