Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a94f07674be979…

MALICIOUS

PDF

86.2 KB Created: 2021-08-04 06:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c483a2a0a0a865cb43acd4638d2d24f0 SHA-1: de10fb0d4db29ba86bde61f50b40136bf4039357 SHA-256: b6a94f07674be9791971e25260f53fb042b879448a2926cb9c32e563249b91a8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, including compromised WordPress sites and potentially disposable hosting. This pattern is commonly used to distribute phishing content or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=ejercicios+alcanos+alquenos+alquinos+resueltos PDF link annotation
    • https://immobilgold.com/file/gerobezefobulopap.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160909e89a0bf4---57003483986.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/23607005274.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/23898686787.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a1730c5fe5d89392e4304f1fa113f72d/40255892364.pdfIn PDF document text
    • http://short-story.ru/upload/file/xunabixipixiv.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/vepojivixiwuraxo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609eb7cd891f6---65891251862.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/bosugupupo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffcb2377f6---25806073480.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c1abbf06f9e1f163a51343bcc9d50975/56649016217.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/wobimupazurirasadog.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/61c3e750e504310bd121c665b56230c9/gitinokeposos.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/716kn7jh9ubk4n9cbphr7d44c7/menalojizepugo.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/safigenelejejozoxe.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/40734361018.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/tupazugatizoz.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16085610ba1ecf---69899447091.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160794413282e7---wipumidisawarutiw.pdfIn PDF document text
    • https://mytopics.it/uploads/file/54361620324.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/36329519320.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/pufarujigimuturiledumu.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9bpa1njpu0a7nmlgpeldfoa703/penifitikerapelokutoko.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/66079974829.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_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 19464 bytes
SHA-256: 05145b727cd2b619acc105cd04db791b3ee204a13d0ca5684638a6b6b6a9aa4f
font_01_sfnt_off000118b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CE 10584 bytes
SHA-256: 52e3f87b9eff3128796f012208ac18fdc2632c84322f2b06d7863fe74a2cf2ce

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