Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf40c92caeef5d51…

MALICIOUS

PDF

106.0 KB Created: 2021-07-19 09:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a6fa69e5e7142c10946723aeeef37eac SHA-1: 04dc7e99dd5e774c2488585fea62a53b59d2b023 SHA-256: bf40c92caeef5d51769c85c5ec58a773bfde9d3131c7671aa1aee3293ef0c3f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which are compromised WordPress upload directories. These links likely serve as a redirection mechanism to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/a2h7v1lm40ajbjra5uogbabtcl/35638276932.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0e4b66cac6acd61392f5ea2f35d79f8c/151521816.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb3e619ab---daragesejaj.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/tajeripawi.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3db1b5df7---37996072974.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/8lk52bh50sf412ve0j4k7o0qed/36262580307.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/b0t3fjm4t1fqpc66b71brefsfs/1618982929.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/rudogexaj.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609a08398d84f---51518764112.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b34fb7f06184dba6cfbf335c44dd8a4a/mawusada.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/932bd0cdc270085ab2eae2d14352e01a/liziteje.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac91682c2cf---kikofegusojarunegero.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210629163212.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8114f61a1329f13d7013928fa2f30b54/51900471613.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083005a7820b---tudapa.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210626120403836868spe887.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/ruzenevaseba.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/63cda0e56a38ad4789b51b4bba5c5a73/41991002041.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/xawukanufiwipupajogat.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8c12c3f67---6205911306.pdfIn PDF document text
    • http://chieucoingason.vn/files/87033059382.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/pozudurakulokux.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/h5ejgj35lsqrvn2c197im546ju/45397841117.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79687623299.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/85a5d611bb929e37894c1ab62353972d/7269422692.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/de3e9eb9d0976d0fd6b9b284be67b4b6/1694687737.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/seriruwenosonigivuki.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4ef7b7145546afb3db83eacf7a2cc83/xozovotilizozumon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+cove+video+guide+answersPDF 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_off00013b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B20 17776 bytes
SHA-256: c3f08d0e9fe14dae68fc41db82f0be02639d7a50040073e8233215e7d9cc88c7
font_01_sfnt_off000169e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000181f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181F7 10720 bytes
SHA-256: 72215044ce5210c04b0f22b3b6747eb1872fc820c3340eb966c45f7ab390cf37