Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8dc5c2ba0eb0e7…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 14:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7adc83abe0d883fc2431a0c00e9a1d4 SHA-1: cf05b860b2c1ce748c4412c723c287c0ac6a2c2c SHA-256: ed8dc5c2ba0eb0e7d650fed9935663e5826f8bade0f6b633c6b0820cd2751fa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://execdentalclinic.com/uploads/ckfinder/userfiles/files/lixirosajeko.pdf In PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/97195f73fbec7ddd9a0e5f0f3bfd47d9/57977198358.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/sivegutoduga.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/64168377335.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/gotugatogibedobov.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/xawijawogovubin.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ac3eb8f4---potikif.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/pinez.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/49073673377.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/73451386735.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210914_142041.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/48776671094.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/modenamoluwamilidug.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/dadop.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/90601782548.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/vimalomewadasusezabag.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/64828209597.pdfIn PDF document text
    • http://maxbrio.kr/files/files/zakanisuwawamada.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/gasujufamokenos.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c420608f385017d339f3bf2b7f3010f5/63354438060.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/dosepubupativokiri.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/guzofaseteleko.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/boxupowumikavamonilapa.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/runuwatunoj.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/safumapis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fnaf+2+free+gameplayPDF 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_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 17608 bytes
SHA-256: f9d9b43eb1e9e65eec512ce5a0b9e1d5f817c65ce27bcd8a6adb1fe85bd0ac3e
font_01_sfnt_off000113f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 10436 bytes
SHA-256: 8d691b98e6930479cc0a16f9c057047f8d2f788d0f9d940b5354e040c15d2f05
font_02_sfnt_off00012ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1