Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffbbf7926a2b0e1…

MALICIOUS

PDF

91.7 KB Created: 2021-09-05 05:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40130c9fd6dc2b31c95c5d72e4ed0d12 SHA-1: ad40c9245cfed0025b1cba7cf6ee1aeec2342775 SHA-256: 8ffbbf7926a2b0e16ea04521648ed066e9152cf274395de9e180a988dc091e10
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several URLs point to compromised WordPress upload directories, indicating a pattern of hosting malicious files on seemingly legitimate but compromised infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://abwhopewell.com/uploads/files/badusikerilu.pdf In PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff1c376d5---nukepipuwanopojotodajamax.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/nuruxatufepaliroti.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/doburatadorafosiximi.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/34075628758.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3cf9cbbe0---xetoguwobe.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/28024577479.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5iu6s6q1af595s0laeq2vhsv61/75286238442.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/47452443613.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/58517169101.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa213a99b84---donaxifepusu.pdfIn PDF document text
    • http://billcolletterealtor.com/clients/e/ef/efe7172bdc9c6addedf700543cb5cb37/File/dikatovasidow.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/kototosagi.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/62058081340.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/22162502630.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/95928861454.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/zizazaboz.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/cb9a25891773c59614ae941cfb1ea254/wosenomusejorewasako.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/nuzezuxozanas.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/44232796566.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/17583122391.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/dademidopiviv.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/vurenovipolokimal.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/lamepefabeberizimiz.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8741496ebb---sinabatugomusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=php+wkhtmltopdf+footer+htmlPDF 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_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001113b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 18944 bytes
SHA-256: 485de3bc168821fed20f8f8953b2a1c063d356bb049c840dea211f20a2cb421b
font_02_sfnt_off000142f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F5 12404 bytes
SHA-256: 0d3cf3af4b3a787ded3f2337793e8107f8f8dd0f8ae2c40ef754cf75d4fb3ec2

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