Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbd6a833fc7ba98…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 23:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49dde503a37aaae70438d31132fec48c SHA-1: 870c6dcf531ad69292c76a534ba90ae362a751e3 SHA-256: 5cbd6a833fc7ba98628bf5c6fe06a94e8df81ad9a2f893546cf4144648987e74
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to numerous external URLs. Several of these URLs point to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

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 http://ansing.nl/userfiles/file/mutepibixewiruduk.pdf In PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/77f6fcc375106b56ef849a388fb14001/viwaj.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/37476775024.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/jodavezuza.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/99885983580.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/lefepufobiwamizatumewosu.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/beae848a9699acee207c32e0777b6c54/43751539458.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/gixolefomedixujilo.pdfIn PDF document text
    • https://luminex.pl/upload/file/94461993135.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ladj5g3lr6auqat7cqm88178ie/76574244534.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/98216821975.pdfIn PDF document text
    • http://amdind.com/userfiles/file/lijapif.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/219b0f2e5b97010ff407910601016837/dulisuxibadalulubiz.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/73119846191.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/88968511666.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/083ae558537540a6d902865a8e1c49fe/virizotawemelaranuw.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609edf938684b---67251758807.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/zoburixamadunamato.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/41079667346.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/16830012902.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/fatubex.pdfIn PDF document text
    • http://primaneighbors.com/userimages/54747907804.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b15f6d0b1125233dcf34eb6e42e0614b/23689256995.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/73731285889.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/31635208981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hal+leonard+guitar+theory+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_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 18672 bytes
SHA-256: ce49640b70c27d2bdee0285419299cd70b69ba542860f97503acec6e2918f935
font_01_sfnt_off0001119c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119C 10816 bytes
SHA-256: 4f2a5dcc0e20251b4bcc86c611e5c0118854608197893a07affd59a1bd8878db
font_02_sfnt_off00012a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1