Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca32ad1b8e7603a6…

MALICIOUS

PDF

76.6 KB Created: 2021-08-08 11:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a7c40a332d0b825906cb696bdb338943 SHA-1: 666abd6cfca01611fb037b835f72ba90675a5c91 SHA-256: ca32ad1b8e7603a6d3359895ca96c00346e37bb025f8b335f67901e8ebec7812
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute phishing content or further malware. The presence of multiple external URIs and a link farm heuristic reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://bjsteelvietnam.com/upload/fck/file/wawupewubujegotejozaberud.pdf In PDF document text
    • https://warungmimpishio2.com/contents//files/mepododuzovugolu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f02aca900---92539993610.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/e5f9kiq73ig2hp5phk87vuanka/bugabexobafedakidujuzeg.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/80923624151.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa0db5d41d---57563508343.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd41ae109b---62464423545.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/bunitadosomi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16109d01275fea---55811993784.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/vititilokuxob.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b39a3970c---32707643764.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/pisopikusomag.pdfIn PDF document text
    • https://medicula.pl/web/uploads/files/15415289782.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d08efe3baa94a81e6659528dfa5d303b/wonojumaguzakemitenumekab.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/zefufininufisusom.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb98d09ba4---gewipabimetosiginapire.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7a17499c---86109364129.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/14827529353.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089703fb43b8---68765396683.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a12d4f471---risufojabomuzaje.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/omej0h0163u7045kc21vismef0/65303588450.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///litadomarisuritalezoma.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9b756fe157f450af306cad852ecd47a7/16078600507.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/b5592cb25c37e6dfc9f7a04b47afcb3e/sujugeduvibovesibu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/fhejhjjl9gtkn8fn6p7qmjncua/wupom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=james+e+huheey+inorganic+chemistry+pdf+free+downloadPDF 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_off0000c696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC696 11360 bytes
SHA-256: fdf5e5ac2893ac16dcfd33c893d6559e8910439c927845b49b1f1ccf0ab1ea4f
font_01_sfnt_off0000e102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 16716 bytes
SHA-256: 9b361a9e637ff62435f863fd607bc369afeb044dc9584757fd1ca1054fa1737f
font_02_sfnt_off00010c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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