Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93866c7c75c1c33…

MALICIOUS

PDF

77.5 KB Created: 2021-08-27 15:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7dcbdff2f211c2c24484d83552b59eb3 SHA-1: 01348b8b567d6795eb78c8d3f861d061cb90afad SHA-256: a93866c7c75c1c33c9433afe52d2b8cb816864980e24786e6f2e1ea59fd567be
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous links to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://parkwaywest1974.com/clients/861606/File/ninuzog.pdf In PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/7dock8mc1fvrv69itt831so995/65987249774.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/15604561924.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/degofaki.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a7b6afbfa---dalatebubowefe.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/98aba065e89ac2b05e99daf39949f6db/37290823652.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/2291df10975b4d2b71f328d49de22463/279103982.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b019118af---betuzijejajutepobesas.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33c27e9e02---sitaja.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c933214e1---vegogene.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/25341151903.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d3963bb34---85078289100.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/49577366409.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/88083951005.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/miwiferaminepevume.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/sesufimarolesi.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vekefufinus.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609b01425a622---donefiwotusolokekajadumo.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/4626617520.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/dijitofov.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/684d41de944d0bfb68024345e84ae544/gojuwikarovisimobudif.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/nuzuf.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076355167a8a---30806303533.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/foril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=identify+the+types+of+elements+in+the+schematic+diagramPDF 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_off0000ccfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFA 16032 bytes
SHA-256: be9245de75af1014b00e92adf51489390fbf7422b5ef24b28b145872b750a61d
font_01_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 11132 bytes
SHA-256: 436b5065bcc44e0fddfb300bf62d4122dcb55662fc7f60afc758f742273c09a7
font_02_sfnt_off00010f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1