Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0828ff68a2c9e41…

MALICIOUS

PDF

75.8 KB Created: 2021-09-08 06:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c447b8694096f7ee67c44a25faa3b663 SHA-1: dbf1080587172ab6068d7347e079e966c8ecc52b SHA-256: e0828ff68a2c9e4152cc7219e7bd9b55523ffd21c0950fc6807c6442874c20ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The document body is heavily obfuscated and does not provide clear instructions, but the heuristic firings and URL analysis point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.upperhousedev7.com/ckfinder/userfiles/files/waligaludosipefubesa.pdf In PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/41875267078.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/wixor.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/69704331814.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/filudepegoku.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/lapezogakirodibititaz.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8ef5386d8---25120157288.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8fmqq6q03ikjssem9tva795rb7/zefesakoviwapunu.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///zupabibatanokusutozemo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5385263e5---50023822806.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073fb3b7c219---97695030523.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/8f6406344479c0daacbf5f6024e546a1/36592520573.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/pumirimoludil.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/42813665966.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/gulotanibegavojesexo.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/lufijevugiveluwudo.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/97605786895.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/rujirogesenovem.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/1459066068.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717de7c06dc---83167290806.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3aa47d069697184e67620f82ef5e6063/kusokanixafozawovuviwa.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/19856758139.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/xizaz.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/93u3uavvrvj41iiiv2946e4e32/29428041330.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/25616360226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=iball+router+configuration+step+by+step+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_off0000c359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC359 11100 bytes
SHA-256: db3582441b6195ca5359e2dbdde42a4d10b6ec307346bdad49b3dcfa18815d6e
font_01_sfnt_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 17084 bytes
SHA-256: ef4f06397eb1969baaf923d7f538a64ce272447dd6f083eff7615626ab001887