Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68df3030503c5e6…

MALICIOUS

PDF

93.4 KB Created: 2021-08-07 03:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: cee4542254ecb563ad3a904251a8f11f SHA-1: 544c34242fe09369b983c958362e66f779ab7857 SHA-256: a68df3030503c5e6f297864b46ca4f4229169d1a6f9ad804c898daff4d04167c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://orderleesushi.com/uploads/files/90961225906.pdf In PDF document text
    • https://tempegaring.com/contents//files/79288702573.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/puwefivizomuza.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7kv7k6uc5t0kqfksqlfpfbcbon/nonaxefuvodeduv.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/32229203043.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f624eaefaf30bcfe79cd2d8a8ad55e0b/81684980286.pdfIn PDF document text
    • http://exima.kr/userData/board/file/bajurenapitigibogi.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/26201001842.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210716_5D1A62EEB8C17FEB.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/5482604988.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c859286f9d---41475684823.pdfPDF link annotation
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084898cb3fdb---vifixedogu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c5df96c45df---nosew.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/diwuxuzonajid.pdfIn PDF document text
    • http://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/43476877838.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d11436832---wusesex.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/retanirebuxu.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/81499610276.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/ruworipeta.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a2286d10bd0---42144493938.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608227dfa9f0e---6629175383.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/22374003353.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/xiributaredaxebipu.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/97522945446.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b22fa491f6---51075400519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=quando+come%C3%A7a+o+outono+2021+brasilPDF 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_off00010139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 20412 bytes
SHA-256: e43750fec053f1bfcd7aa0001586f930560222e585f3f045c15ab98b6f2300ee
font_01_sfnt_off000132ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 11320 bytes
SHA-256: 324196e3b62b41d885d5af409fcded68d0b01224c788657aa886e1e36a53e7c5
font_02_sfnt_off00014d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1