Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5842c85ef076c8…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 03:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e70ea094c0923e9f2d684a4733c45573 SHA-1: 0a4e5299545a67a3ff6ab943f82c0439ec4a1786 SHA-256: 8c5842c85ef076c80780fc1db3fe44972d0b5ab100620995c9b7176881be2a12
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. These links likely serve as a distribution point for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a50093a4d8c---bisalokofo.pdf In PDF document text
    • https://bluza-shop.ru/content/File/70121836035.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/pidufozixuz.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/jnllenoge8m59gpm2537b9tgq6/37582678469.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/43390361695.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a9e941622---2668819119.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a74a98129---kekoj.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/11233019984.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/91111153200.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084888b1435e---74995977990.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/sasebe.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/dezuxox.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42b218628---78877221573.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/falof.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/15753094150.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aba3a27c4---1276548889.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/98900889156.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/fiboxolenaxumidag.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/422613463d962ce776d014c9305a696c/10786568521.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/28jgu2tadscn9mtg153npi49b5/29354921823.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/zokuzezak.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/81306227383.pdfIn PDF document text
    • http://kelvista.lt/images/files/58593667322.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/lenop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pretty+little+liars+the+perfectionists+sez+1+ep+3+online+subtitratPDF 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_off0000d44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 11216 bytes
SHA-256: 8d2db922a4358746d662a31d42ef91c62be1223a899c114bf1ef3444e056a113
font_02_sfnt_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 17452 bytes
SHA-256: 0d8e1ea6873d8da0743186ba5c73ce109864a995fed80e2ce80a92a02058c410

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