Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1027c5a9d6417d…

MALICIOUS

PDF

96.8 KB Created: 2021-06-28 02:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56e28c6f6bdb2363d017ad7f05ca5c6f SHA-1: a8d4717b49ed7bda1fb61cde7a8485c7d1a14625 SHA-256: 6f1027c5a9d6417dda7233dd12c8bcdf4881afefb6745c9dd32af3a92686e6af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to lure users to external resources. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan, suggesting the links are intended for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/085a0772d9f67ec1c77af266a5ec97f9/mupizudutaxaravogerasutar.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/06a84600ae98f23775d31d4430b57803/binoxumolaji.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/25a5902de3be5f1a01ffc0f5f286e260/kezaturumokiwisobu.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/84039877973.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160831404ac5d9---fisokapizipabaxamazado.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1473aa3cd---56206370376.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/60abd15196de0972d865201836779acd/xinodon.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/piwob.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/8e087e770d44da16f53615495ac2a3bc/57388509261.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ae134fa71---gatepasog.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/7c40ead0d0b52027952428b710583e3e/45966942963.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/64951381020.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/77fb34ec76d39d33c264556cb84e8df8/gurasuwa.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0f062a3d998bd2f09e85eb8ec9cc529a/10161943833.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bab8e73582e---wumijesusixasukug.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/girijofowaxove.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16084391c8ab0c---26786369139.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/3a2ec30d0705b5754cb603611427d817/ranezivejurosinuxabe.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b563441ea---delenefebozuvivokijibegaj.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6034b22e6---37375188129.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/40270309901.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/367a9939cdf8946bb2a017e5314bef5a/56215564071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=accounting+for+leases+pdfPDF 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_off0001169c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169C 17664 bytes
SHA-256: b8f7972727cb0a983dbce35b2b4f794c605c586409e09d8a0ee046d55acc0d0f
font_01_sfnt_off000144d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE9 10876 bytes
SHA-256: 35979cf8e870ccdafb59e59673bd4ca7017942f904c0f749002866f5357e7b0b

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