Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b632b4cd177bb6…

MALICIOUS

PDF

79.2 KB Created: 2021-06-29 06:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 013a8d03ca7b86c79b4fe7ba4b560e51 SHA-1: e2c8a8cb7980d984bd1eb3ee2979c0d445db4071 SHA-256: 88b632b4cd177bb6bec4ecdb3612598c31e758ccfbf146bbf866934eacb6c438
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. The primary purpose appears to be redirecting users to potentially malicious content or phishing pages, leveraging compromised CMS uploads for hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/10a116b9b2543ca0ca6a5ec9bfacc75a/49743566826.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8bcd220882bd90c5d15071f185611a9f/42024636132.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/886691be3c256b234c7246abf77597be/tarupegoboropewexodofak.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8aa03214fcd2dc08ad2b4366c63e75c9/tozibowokenos.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2548f261---95395000805.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c776774a3f6---wikukixij.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b426e5b2c75---55031066084.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/2bqlttig3e9imems83ba6dj859/kapawodebos.pdf
    • https://x-software.cz/data/file/bubozifuzigajoj.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefe421483---53125166941.pdf
    • http://stphilomenaonline.org/userfiles/file/butidoxetatevamefapu.pdf
    • https://combrooncom.com/contents//files/magexebexi.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c596c0639f---65756298059.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/eabfe4a48b3c56e29e6238f7516a0810/33822772848.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e0cbdf35b58be0f1570e978e68875c89/5030585294.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba3a6e196---19985839144.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac111539fb3---rubozapoxogofolexut.pdf
    • https://zold-kommando.hu/files/gidapemepun.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0aa0231823d90a72b9619a36364eb59d/xitamunatajuzuretalutu.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3d541cb56---38828556998.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/itdu45v1jd9uf7iaoi6pmgdtk0/78011969531.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608f499fe1672---vekebiludazakes.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/582464ab2be9c151f5396941dcaa7d47/xememivoxeda.pdf
    • http://agcslohian.com/userfiles/file/vejajemunolebovexe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tenure+meaning+in+malay
    • 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_off0000d28d.bin
2bc27a4f6dc412a614d782e056acf20cc6d072300132dd0b0c607fb0fe2730bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD28D 17616 bytes
font_01_sfnt_off000100ef.bin
6b606fdf8f22820467a119b453c944442f3fa81ad0eae1e8006c4a113266b6e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 10240 bytes
font_02_sfnt_off000117d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117D6 16792 bytes

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