Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce25ca945567416…

MALICIOUS

PDF

94.3 KB Created: 2021-06-28 21:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff1bb8ab39422adac2d044e592b1dc73 SHA-1: 720020f6af62f17ccf188ae3f46ce5bad57ec8b4 SHA-256: 5ce25ca9455674167eb9d428e064c2bdbd085a23c3eda6aefd6957f087a841f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised CMS upload directories reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf93e37f98b---wokamabilad.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ad74875ddf3270d024b2a603fa4bfba2/gesevokani.pdf
    • https://aksukartela.com/images_upload/files/59526999313.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d7fe27266---26678440714.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e7e4df67---74725146180.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5nuofcv0oj3a26qrg08i0c2tu7/jozegifexokukeweze.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac00167b9---ruzamowivalurikujeberudun.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c428140a4---dolopol.pdf
    • http://autohondl.cz/userfiles/file/55628632144.pdf
    • https://aviseco.ro/userfiles/file/panetuxekefomos.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/tpkup9t7m8gpp873rmt3q24pp4/31180338870.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079b1d164e0f---88880715935.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873297430d2---xipopud.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/033b372f242956e8087c340cceba2d27/24946480709.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b206f6c8e9---wofajateje.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a92445f271---96492604067.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abdcbda0beb---20636336929.pdf
    • https://soechi.net/userfiles/file/87249348236.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/9fbe2a97a31b27ac056d63ddf697de29/romulofokidokotisebate.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087f5b789d1f---zujukilon.pdf
    • http://aldara-latinoamerica.com/userfiles/file/5638412004.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/tdvomfqui0v1lauk66kfq9t3nq/jimep.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ed1d82f8ff4f5b7c22512ffea95eb48d/89398505593.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a1f5f316d---fovoxinanewenekevasusipi.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/molasodokitujakopudir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=simile+meaning+tagalog
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100f0.bin
09addeb75f39ef01c72f38ccb3b1c9f6bff4dbc821359ea601ab83b7620a7d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 2252 bytes
font_01_sfnt_off00010aef.bin
e7fb643668f0e90230369ee1deac003dbd1329936b5ba4ef48210b42ec6e19dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 10260 bytes
font_02_sfnt_off000121fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 16792 bytes
font_03_sfnt_off00013a0e.bin
35e88523cdda1b124af88ca95dd4ef1f6bb6a5a1fab6a56002ddcf9d137f81e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0E 18968 bytes

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