Malicious PDF — malware analysis report

Static analysis result for SHA-256 532a6f3c5f3680b1…

MALICIOUS

PDF

86.2 KB Created: 2021-06-26 21:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8813074d4abd7f30ad9c617d39cff260 SHA-1: e0a2b8d68347e74d139f25930e939e4b70779b23 SHA-256: 532a6f3c5f3680b1d7e2e518fb1e109e583c5b8c90b6dc4a9ec25f026ca03074
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 embedded URLs pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=microbial+diversity+lecture+notes PDF link annotation
    • https://binarbaid.com/public_html/userfiles/file/dalowiloxigiwu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7639c02c1---dimuwipozajafibu.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/roluxewizufakafelijile.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3b5b200c---23599728802.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/23297eca785d3f220cf7d9966df07ed0/toritasipukurajalawenu.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/veduduku.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/e42ba59v7h25m3ibg90kpj84r8/3410596531.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210617171843.pdfIn PDF document text
    • http://teplospectr.ru/images/files/36190369932.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/360df8cd310f367198d5be110e0ad384/wajimowekemazixedati.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/96430e0fcb8d0acf5eb68a63c41c5498/16597469330.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/55105996208.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/51842776460.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607924e37a637---kotinifudaw.pdfIn PDF document text
    • https://noddy.nu/images/file/12376558271.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21a96b8ba---52991342342.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/df2b48e5dfd52b537d3f0c2c42c3594b/85656032216.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/f916552b302e22e0c495e2a9f4f1269f/91713999274.pdfIn PDF document text
    • https://digireg.se/upload/fibelonu.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/c4de7c5a4ef4bad59ddd14a5f64d134d/82502622563.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/zolibonarejin.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d5518debb88---20879013100.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/40457623086.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_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 10776 bytes
SHA-256: db45260d615b5520f0051dc4a57e1e2736842d735c2a855ba14c74d0c90198a3
font_01_sfnt_off000106f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 17076 bytes
SHA-256: 7b17a5669755a0ec9b2ebe1a7f4220d40e70308db7fe97e15a02b7a55c733a38

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