Malicious PDF — malware analysis report

Static analysis result for SHA-256 910daeaa9bf91b5c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 20:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ae6dbe79885c8575149ee831bb272653 SHA-1: 712cae5db4e01c5c72cb7e2c30f60d0b248ec464 SHA-256: 910daeaa9bf91b5ce861cba041832cefb4dbd64fe2e7b7e61600295c59d6baf1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, a common tactic for phishing or distributing further malware. ClamAV detection and ML classification strongly indicate malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/0oef4laqf3v1dqt3c77lg56lt6/32815947737.pdf In PDF document text
    • http://patrick-vallot.com/upload/files/56368791182.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/bee7411e9b6c6b19de9adaf98d27c5b5/rilorakumixoxeda.pdfIn PDF document text
    • http://camwater.org/media/files/zureleguziwa.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7l6unak7jfp16jcf7g1vgfm3b0/roxurukufigekifiw.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/kavosigeweg.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/7818983055.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/xunubenakazatinebitojelal.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607588a4e2246---10404968776.pdfIn PDF document text
    • https://jagominum.com/contents//files/zukezujizi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa0fb8257---wifemagolirofaroj.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/sukoxiwogutepofonijivegi.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021071413103780554.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c548bb611bd001fdf03c0ecebfcef392/5865566414.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/miladesewof.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202108230950596033.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/kojorofusepozegulukolit.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/fidapeladogi.pdfIn PDF document text
    • http://geasit.it/userfiles/files/75279434683.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b141bd4d3c6---5336533694.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/11833394972.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/bg09vabci9s8295auoienkftgn/xududalisolenale.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/59713697541.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/992fe123b0084e49f59b89ac745e577f/rikaduf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=catholic+funeral+and+cemetery+servicesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 17880 bytes
SHA-256: e5a7def8aa98a7374384fca0596ac745004b957b140313d24e0b474672893615
font_01_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 11052 bytes
SHA-256: e0b0cf6c16b5b7c2ff46cb6492d3396581fe049cb55e0bc9d5dfc404eae7ad75