Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a9bfbada10c502…

MALICIOUS

PDF

87.1 KB Created: 2021-08-09 19:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd5148bd40c943d917bcb66b033b3fbc SHA-1: 87e5fbc09ab1fd6b8adb8dd280e5002abc51e857 SHA-256: 84a9bfbada10c502b085a5e04bd0af30911f1315378eb10c880034ac7484a81d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware distribution via these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec90caffbc---84513045170.pdf
    • https://footballsod.com/images/ck-uploads/files/35483211926.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/q8mtfjbc0ao4g9i3o5nfccfs7b/37025288099.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/1e58d82f941f4cb8218984691a0d45b4/pikelolupe.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/37595258168.pdf
    • http://www.trisad.kz/ckfinder/userfiles/files/36027133954.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dd26ba6c3---59253578789.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e1b7c221---bararepegevexaniwitebod.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc9bb0e272---vagefufevilebidev.pdf
    • http://cariboohose.com/userfiles/file/6568941893.pdf
    • https://cengilli.com/icerik_images/file/xefisujebes.pdf
    • http://cityclick.it/userfiles/files/17850719737.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbadbfc98---79735201606.pdf
    • http://studioego.cz/userfiles/file/61212447808.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaac0db89c---wetolapomobiruwi.pdf
    • http://benetalent.com/upload/files/19447984166.pdf
    • http://axwelindia.com/uploads/87216512167.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ajg3kogn2j7t7nonkp2aust16c/61582394823.pdf
    • http://abwcrainhwy.com/uploads/files/95973725201.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bdae92926b8---56299143042.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607864b933388---56246606569.pdf
    • http://secureyun.cn/uploadfile/file///2021080618464291.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=notes+from+the+underground+dostoevsky
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f29b.bin
28dad9f7502be6acd52c7919f2f427ae7d8622f4aeffecc04b57afc173aa3301
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 16376 bytes
font_01_sfnt_off00011cdf.bin
626d6b55a8be0c90c11fe1e80d433ce1321f239a783a254a9a6a3eb2bffaf29f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDF 10852 bytes
font_02_sfnt_off000135a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135A5 16792 bytes