Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20b56effc587d40…

MALICIOUS

PDF

83.9 KB Created: 2021-06-27 05:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb9e7384ddbde39b925571889cefd54c SHA-1: 4a43cd412ed037054fab3eb37f651d735c5eae66 SHA-256: a20b56effc587d40c22430396ca9801829baca3ab30df58ca728e82d297063f9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress upload storage. The ML classifier and ClamAV also identified it as malicious. The embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc6484bec---muzawipibip.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ff8602fa7---77277474145.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/d529f8362aad0be5b61d57ff9b5d0a83/84711294343.pdf
    • https://amitadevnani.com/userfiles/file/jazusaxemogikilimoropokuz.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160969766c77f6---govowozezuluja.pdf
    • http://vce34.ru/attachments/file/sofomogevajurageganuboxam.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f342c7df3f---57359019901.pdf
    • http://pokeocncafe.com/uploads/files/51226799323.pdf
    • http://stroisvias.ru/userfiles/file/gugevegaxumoximokoravub.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bda8f9777e2---42195036407.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085406cda609---92993394331.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/ketoni.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/vlkn8atrnrt2avqpmg1f30q1kv/25661054021.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5c496134ef67e4a719798587655b683f/rodawon.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/6153a54f30b0294c8845ce72c48cd576/62071020260.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/11f9d875bfc99fc2506b77fffc869d7f/96443167134.pdf
    • https://sunnyvale.com/wysiwygfiles/file/rukelekodovabaguwifad.pdf
    • http://zge-led.com/luodan/images/userfiles/file/kexedizeminasopujatukub.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/fb30cc858a3aeeaaf0f1c6cd9692e8ed/xitawobitiwarirokumo.pdf
    • https://atpl.aero/ckfinder/userfiles/files/radivifilekufuriten.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/510cbc254368b83f8c154a4cd7a163b8/nedolu.pdf
    • https://aartipalette.com/userfiles/file/55925426121.pdf
    • http://londonjip.com/userData/board/file/73389889193.pdf
    • http://steakclubhn.com/campannas/file/konobodiwikevafureg.pdf
    • http://mynigaoe.com/upload/file/20210511182215.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mechanism+of+action+for+oxygen
    • 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_off0000e49d.bin
16c77e07e5afbf122ee40555d5e03667881e091815dfdfe34f49c7ab429a1838
pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 17012 bytes
font_01_sfnt_off000110d1.bin
3148e609633d716b0a4da4b0fc7cefe2c9b548979e45c0360a0b8711d78da0af
pdf-font-stream PDF embedded font (sfnt) at offset 0x110D1 10948 bytes
font_02_sfnt_off00012a16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 16792 bytes