Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59739cd3ff11f9e…

MALICIOUS

PDF

85.5 KB Created: 2021-08-02 21:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 74f8acf68b5a37a2f12a130706ee1fcb SHA-1: 8a5652803f5e583f48203800df8b7319f905e8bd SHA-256: c59739cd3ff11f9ebd25e2ae12dfa8cc3c531913fbf029139c4fb3800ef72f32
156 Risk Score

Malware Insights

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

The 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 embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://irlanc.ru/uplcv?utm_term=descargar+musica+gratis+antoni+santo+en+vivo+popurri PDF link annotation
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c601db3d3---89994297890.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608124dbe20ff---supesopug.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/fajiseletixirinop.pdfIn PDF document text
    • https://aedwea.com/upload/foto/kobodonemuxexawesesokipe.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/gixedalezovopu.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/98144237337.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5c1539734---6735335065.pdfIn PDF document text
    • https://tekartltd.com/upload/files/51861533180.pdfIn PDF document text
    • http://synowka.pl/galeria/file/devoweniziko.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/a547aafd818d0d5bcc4a7da1a0617735/dapakovuge.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/11992926708.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/36ad7d146214c21a1586ca1c0f351e5e/nojupufe.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/virepokokuz.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610580fb43538---sozenumiwuxodinuk.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/28508087088.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/33929350470.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/bupezeraluta.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d2339c60---gisow.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/dlijp8j3p5n9e1nfm4ejhcda29/57858069945.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0705f9d6---legofavixinidolewufo.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e0dd4e5c---43597909723.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/subojumerumadoviwoganol.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/70682295714.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD025 17004 bytes
SHA-256: 065f649f23a9310fa6640b29ac8c75c02901c7d82a5230c4d6ee0ff60a6431c0
font_01_sfnt_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 17612 bytes
SHA-256: 3883d23fd97ed57e8e74937815dd3f2e9d7e0ff9655dc54fd59922caf47189c5
font_03_sfnt_off00012cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCE 10836 bytes
SHA-256: 50a7c3d95380fee17415b115f696ac67ca8de3d710ccb216644ae66ecd9af934

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