Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d81d3369042f215…

MALICIOUS

PDF

75.7 KB Created: 2021-07-03 14:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9666f2d66a44eaecc85811cc04babc4 SHA-1: 25ac2e33a08eeab09e324d58e21c981eb9a582db SHA-256: 4d81d3369042f2153a1311d13156e6542493adc58c203e0a90a504e4e110221c
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3069

Heuristics 5

  • 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
  • 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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c701d91dcf---25953960797.pdf In PDF document text
    • http://avonsteel.com/UserFiles/file/51340581411.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/8d94dc03d198d78b2d42d1f3af41527f/zoluxuli.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/bagoluzoroful.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/64599504692.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9493a69c930a00c758347486135058a2/pudamomozatob.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607caf3be62dc---97782875221.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/pesetera.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/farana.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd964afd2---segolajidilixoxefon.pdfIn PDF document text
    • http://kbchina.de/upload/25355334658.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/87e68dcf12f398d6261ed69d90120a90/ketuxitijerejenojekopuv.pdfIn PDF document text
    • https://2acontractor.it/images/file/22735890291.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c950d100ce---ruriribuvumelimagufu.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/71752824809.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/16248391412.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/539e1b5fd864492f2f267d5b19fdbb37/83980651888.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c323bf4971b---83511352484.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/boguwibafijupovofevirafu.pdfIn PDF document text
    • http://planetamama.ru/files/file/97091417853.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/4u1l4p4ragbrcu6tej6dc70obf/nefobegilixi.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/dasiwuzerij.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/mofaxediselajugipewop.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1ef96201---ziwanetuxipijuregun.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/1505767250.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/cc5a2c9986cb7b4057d5a4db1faccd30/divikezopemiban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dots+and+linesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 10144 bytes
SHA-256: 38cb9095c93d193f0de9aee4766f10da84997919d9ca124fd2d2f7e9eec6ea88
font_01_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 17320 bytes
SHA-256: 36590e2698cade6a522b18b9df5b6f4ccc5b4a578d855f01d92936e348908af3