Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cb5b75bfde8f99…

MALICIOUS

PDF

90.8 KB Created: 2021-07-22 10:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aab933065e293bbba9b6fc08b6b02a30 SHA-1: 99dff8b0d9e3c0917663c9b102115305772ef84d SHA-256: d6cb5b75bfde8f999a6430e9aa48b475dfafc2220b4b15c5fde5a53159b2d765
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites hosting further PDF files, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://eberli-medical-supply.ch/upload/file/94191966249.pdf In PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/14752f6dc5995ff5f078b727fb5bbb8e/vavefomatis.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608189ed709dc---gakavunojufowe.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/doxikudivurijutajijus.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/c15959bd775f0913aba7c9b20613195c/73826024193.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a994b04f3e---foveluregakimin.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608515c99a456---50743824217.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160738257489e9---64867547045.pdfIn PDF document text
    • https://synersys.fr/contenu/file/manojitanuwi.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2eb6f177a83d0f7e3c952e98edbcf693/mewubujorurerutusuf.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/54492238660.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e872adc1df94019f6d378eb8d26c1e03/nosabobarineko.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/xuliga.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/84984569973.pdfIn PDF document text
    • https://ikansambel.com/contents//files/raborimururekopuvedonoko.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/eb32d13e87a4377983e4101018ee76cf/64187026291.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/47949948839.pdfIn PDF document text
    • https://daismene.it/file/puzodezatipenaxepirevit.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/vulupokuposuzumoku.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609895643ac0a---57903652681.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9afb7c78fd---kuzitebonuxeraxuzedizupav.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/53431763948.pdfIn PDF document text
    • http://co-mit.com/uploads/files/wobobobosasan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=have+been+havingPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 2280 bytes
SHA-256: 9654f58cd3cfc2df9baccefbe45ed465c90501f8c691befc07d9f772b730ff70
font_01_sfnt_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 17008 bytes
SHA-256: fa000c4073c0361c8f48b01318ae06be46e4f714d13ef17db9f94b6f58611fe3
font_02_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 17872 bytes
SHA-256: 458d9dc2a5f75a4d511645082325b0d43c9b579fa494b5c3e10e16b4d57ae5be
font_04_sfnt_off000146e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E8 10052 bytes
SHA-256: 97c76063dc26ee25757fcdf05dcc33184f9e43d3c18be7872475679ed75b462e

Open this report in the interactive analyzer, or submit your own file for analysis.