Malicious PDF — malware analysis report

Static analysis result for SHA-256 65356437da2d0c99…

MALICIOUS

PDF

94.0 KB Created: 2021-06-27 01:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b476aeaf04fd217efe98f16b57ccc9b SHA-1: 4d9ca8bc34dbd39a5534b0985e355843b06f08e7 SHA-256: 65356437da2d0c9914239d8214a38a040340c307cdc2d58446edab087fbedb4b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rybczewice.pl/userfiles/file/16614409951.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2ad634679dc22339eac4c53f58046c45/xepusivufoxemudamaw.pdf
    • https://accuratesearch.com/userfiles/file/nakiwukewo.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/20250712376.pdf
    • http://quick-thailand.com/images/uploads/file/95002868110.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6da9d95f4253c00411aa904f7afacb8b/71248134343.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160791d1823635---nesuwane.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082025d46510---17097572378.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e622cbc6c4---lodulewuxiginawagisa.pdf
    • https://triangle-electronics.com/assets/userfiles/file/pazozapafominonakozi.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c926fb02d76---30620053741.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/e8d0682cfca12e23c86e016467282d28/nuwawijobafukuge.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/646a19ef9cf65f3e695364631cb01206/fujonegubepudom.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16075c3b921b05---452377973.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ihh10d5ihvgv3bqck697e69p32/joronosepivafam.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1dc901e4f6a3b83b7d4c6799f25ecfeb/7126636476.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e5e30321---14240019297.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ab9d52a0---92300937969.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/tar8scsnrkohm95a8qlp0ia1jn/76727907917.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a027c5f21ce---42261954584.pdf
    • http://www.look4job.gr/images/_user_na/file/suvimazebajegaxaravar.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/d25c75394bb4744cb4aa3f4d2dcd44e7/78468122551.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/81b8543a366010fb1b1f501582d875e7/22878426456.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160841562de926---39210679374.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=learning+astronomy+by+doing+astronomy+activity+answers
    • 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_off00010b9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9D 16792 bytes
font_01_sfnt_off000123b4.bin
537f3fdc44d0add2307a5c42fe1e8173fad462abefdaa3ae38d897eac4521613		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 11028 bytes
font_02_sfnt_off00013d3a.bin
8df8ca42c22511cd2690e214aab059cc6025e0741303e5e62d091c17eb3c954a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3A 17204 bytes

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