Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1362096e173b8c5…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 02:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8225813caffcd778d034d1833b154e20 SHA-1: 61763bac7b1ad7130042f50595ee55138d5d3bee SHA-256: d1362096e173b8c5ccf7c4819aea8e8561c840bbf9dbcc49e56056debaa11d49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=izotope+rx+6+manual PDF link annotation
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081efd1b8378---nisakilotomedabawere.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/rdi3npmjae94cdpgespcmth150/60082686776.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/fehish15qspvkt1ch3qd8e1945/97457479776.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/78d34868940555581956fcd71190accb/60004715512.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/77842385980.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/sepajakajo.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/vapafuwuseju.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/82387493204.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/piges.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/ziwekojuvarevewaboxo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b403670d9---zibazajameb.pdfIn PDF document text
    • http://kiameds.com/images/upload/files/63711995867.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/38999480653.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/24503146057.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d295f1d40e---tevupabetaxemigu.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/zalofezuve.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/magagixavu.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/71059928663.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/jubodelakorimafa.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/55191526541.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722abd18ecd---81366038535.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/jiluxiteporevapetuxepok.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/52862461856.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608872d9c3e59---bajigunewalugov.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02079403b4---14106772194.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_off0000ccfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 18188 bytes
SHA-256: 90d72471f4952761c404532639bc02813091870b73cc8ef6b63f76183d01f342
font_01_sfnt_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 10536 bytes
SHA-256: 60423e2064840c28b0ed61473e6cd3f4a759d8ee99bbe21148d951aa6b14404b
font_02_sfnt_off00011439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1