Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc603d561c7e6417…

MALICIOUS

PDF

82.1 KB Created: 2021-08-21 15:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b43f4dd97e46f68aa752db1b2bb780c SHA-1: b31940a898fde0f74006b5846a41a62fb735c02d SHA-256: cc603d561c7e641736ab40f8944d8c51b65f02cb897cb2f4c19c7c7dd3f7aa64
96 Risk Score

Malware Insights

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

This PDF file contains a link farm pointing to numerous compromised websites, many of which are hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the heuristics suggest the document is designed to lead users to potentially harmful content or further exploits. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750a5e12c74---67687933859.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/88u9lqlt8hp9s4hbkk90t1df90/92415719600.pdf
    • http://diclenakliyat.com/userfiles/file/bumamilotufenebolosigeg.pdf
    • https://contabil-fiscal.ro/mm/file/jotiv.pdf
    • https://kp-bs.ru/upload/files/26303481144.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c81ea7e8---dinusalijusaxo.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b24c1abf3---kumokasunadakonu.pdf
    • https://combrooncom.com/contents//files/dogabomikuvedomukefonimip.pdf
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/55329206816.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72113b2b9---xagopupiwiw.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/eom6te6te42d4qji3u4veo7g42/4949420080.pdf
    • http://ototavandosemesi.com/resimler/file/xisupumomomudiwokis.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba21166d17d---kugixelenip.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4d1db0edebe4f20d387ff717ec14b3e3/77784623371.pdf
    • http://vikingpaint.com/user_file/file/kagezuzodemejufalojumag.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/33b74ca3d8221d804830a8bf8eb6e9ba/tunepakitijijafiluranor.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb82ab12c5---27378624462.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8337cb914---97784015079.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/v4q477tlua3t99920r7m5vjmda/mezeg.pdf
    • http://erulingua.hu/uploads/content_files/files/kakolebesoluxuvopijib.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/48840392970.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/6vk73hn7mb9ct9pin1btc7v5v0/zurilibeti.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/66ui61fr44piqj64tv2burude3/reremobigit.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d3ff9c98b---timetiwopanusebuxo.pdf
    • http://lyzjkgm.com/d/files/jemuxerak.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ab5a7a3308bc5de5143c0d0698c3be0d/66246841769.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=can+apple+cider+vinegar+cause+ketones+in+urine
    • 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_off0000ddc3.bin
8bfe922c6c2cabbb1405d9d8ac38bb106197446611bd4673bae57721deb29e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 16656 bytes
font_01_sfnt_off000108ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 16792 bytes
font_02_sfnt_off000120c5.bin
4e7d9ad1a3136b4819b15fda97613ca9922b98d357de0920dc957adf0b723723		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120C5 10976 bytes

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