Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc8cb3e3d1769de…

MALICIOUS

PDF

88.9 KB Created: 2021-07-30 00:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ccb8d34ff0fbade9c9c03cf1ae6cfde SHA-1: cf58324bcfc76afdacd26079e500ff0fe2c1abd1 SHA-256: efc8cb3e3d1769defaeb8ffa14d34111121b9e25a4c273b9a9a7c72aac87e30a
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 as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of external URI links and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=how+to+install+efootball+pes+2020+on+android PDF link annotation
    • http://chieusangducphat.com/uploads/userfiles/file/54770907903.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/pilijanaw.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/46015720708.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/aa164dc19b9676f47384fdb21c9ca21b/lofonuzosewewuv.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7abea94e3---losikebababarob.pdfIn PDF document text
    • https://network-italia.it/file/gijodurez.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/kizesawapuremobesubopite.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/88038281367.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/38401514222.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/bamudabojujokiweposawef.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/78121358950.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/roweweropamagasuduruxewe.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/56990994532.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/35854112632.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609890a6a72f9---donedovaxomel.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c0b5eba72---rurowenajukidewovazunit.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/66301070746.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/80521225894.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/qg0gbl5rkt0p377pevg09e5mk4/45545866261.pdfIn PDF document text
    • https://jetaime-shop.com/files/tewejakesoguveduta.pdfIn PDF document text
    • http://productosole.com/wp-content/plugins/super-forms/uploads/php/files/ot78vv0n5cdekuimte3rbtnhnp/36715129764.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b2488555f---25265348468.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/ridujezaleradomivapemom.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/xisujulipujolafipox.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/nanibep.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_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 17680 bytes
SHA-256: 9a699197145eb080c4b66756ceb81b81a45f86ffbb3b8d755ef2317f87aab299
font_02_sfnt_off00013c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1C 10948 bytes
SHA-256: 4547160d43069b375552b8e4cbd2247e4cdd01520d6cba8dfba6991667164f11

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