Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ab3dfc8ac6fa97…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 08:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf3176ad08cc414f6849a95f8d442388 SHA-1: 5c7f39af695584555be86c679ec2f5a15419f443 SHA-256: b7ab3dfc8ac6fa9711196caf7a8ed48887e78a5f07ae8f03e08a21a3e1eeb0dc
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/da0srk7gi640s6d34rqq4oisvu/gojobane.pdf In PDF document text
    • http://immobilieninvestors.eu/userfiles/file/bumugugibigupi.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/suwakazumazutofopelixe.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa885303df5---66431276381.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9482f5d8ee---novufaxav.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afabe5a2616---zexorafumekavawimitawewun.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/ruvifiwakilesafelepob.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/54cc713d9f4d2f293e48aaa934bd6408/kefisefiferebimavatabe.pdfIn PDF document text
    • http://alvitraders.com/files/84322590748.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/zijibiwojunatoribazapofo.pdfIn PDF document text
    • https://phnews.ro/files/file/direle.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c297e5ad0ef---wazekowiwajumowixobukaxe.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e944b2204a6---gapibimil.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/16575347222.pdfIn PDF document text
    • http://hevolta.com/upload/file/fanatazataju.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/xowolar.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072272934201---27040573067.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/gujaw.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/qfr7j85i7ntvtf2tq3c58pb519/witizogadexizamotaxab.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/441b780b9dd058e1e4eea91273a1ab44/95007257195.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5811376093---majetakevuniwakej.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/filafunodo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430125149803064.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/101e06999a632c71e8c29b164fd32e73/18318052470.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/zosizuletasoxirafo.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/aae6432753d74a3784c5e72c1022646a/paduvokuwadubidinuludif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=algebra+1+unit+7+exponent+rules+worksheet+%232PDF 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_off0000ccc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 11136 bytes
SHA-256: d013cf711f3d5475ff929d55cc03f82d51da227ff4ef89caa50d45af6fd1dfda
font_02_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 18304 bytes
SHA-256: e8919e1b288527957f9b9c9d95f07e6b4b1eef6b74c66c7e9dca48f4ee82e7f7