Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87dbc5dd75ad6f4…

MALICIOUS

PDF

73.3 KB Created: 2021-09-03 04:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 30db693fb752e536d9bbb2f8ff75f00a SHA-1: 0e04345fbfd5c154700c8b1bc542df4b242b4c99 SHA-256: b87dbc5dd75ad6f4ccbfb1f7fcc884b49a6d98d2acb76255cf0fa3f8a6308177
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=solving+partial+fractions+pdf PDF link annotation
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/0j6e4nnvselhv88e76f6vfi316/88362286430.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94ee711697---83782316513.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/56290925125.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744a8237d48---6764283495.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e318907c5---1364608275.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708a8568a2d---jasapoxudu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f7ca724eee361b9f2795d159543e981d/depukodumezupafugifaler.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/80846938833.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/70692112935.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/fezol.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/xerubuz.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a64c375831---20856767384.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/numebusutatiz.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96886076798.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a19103b7d3b7953646443bf6e50036d/wepovinixelenefapaxakew.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098438958c50---93870872829.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/71007608360.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/e8a7a847c152a6a253489db4016572f1/duvozizibavur.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/jadiluwosa.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3af0764eb---kixizukaretufaf.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/parosekibasarevusofa.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/nuzalezes.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/zotalurukuxowe.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_off0000ba1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1F 17136 bytes
SHA-256: 1a669e0e8c19451277feb7a5c2853631b199df3296dae0a871bc08671b9a8b12
font_01_sfnt_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 10804 bytes
SHA-256: 57393630f1759bf337e915db6b4f5fb0ff6a16a79430b006f1be828667b7e280
font_02_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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