Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c21908c97b9eff…

MALICIOUS

PDF

89.1 KB Created: 2021-08-07 07:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7e14631ceebfbdad0f4da7d4961b8fb SHA-1: 31b01a8aa51233091db5484f638a330b1bbc9f7c SHA-256: e4c21908c97b9eff2bdf6a49991e08afe5d3d20ebac276111455d05a2fff902e
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. The document likely instructs the user to copy and paste commands into a shell, which is a common technique for downloading and executing secondary payloads. The presence of numerous URLs, many pointing to compromised WordPress sites, further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/i7o3oiivu111mr9ra5qsmsf4e6/61515473970.pdf In PDF document text
    • http://yilip.net/userData/board/file/26208851582.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/131bbc946ee6fa0fcd24741c9d209044/rokufezigitofeji.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/45614357659.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5fda5ff33d35e85a0efb5a4475a8f19e/bosironubuvebebosezer.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/59197777467.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eac13ff2a---supikekoga.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071fc53612b2---15343680951.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/165jj0k5q7a7uupebjvdimrhq6/98717951794.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/3215627329.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609974c299415---38394932807.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6bb855b14f645534c3ea332e856ad5a3/pesoza.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/44036448260.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/fonepulopefifonoxojuf.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/gaxubasavurawolem.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610db66e8c131---33189587569.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/keder.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d4ff3bba---tebemazuduvidixej.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c729929e47---19021506475.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/divururesaxobisogima.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b9acosffq5no5riggh7h3tpgg/67313474703.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/90205312107.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/sopomigutamis.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/pugixopopomoxigagulelaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+i+find+saved+wifi+passwords+on+my+androidPDF 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_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E51 10772 bytes
SHA-256: a52c4d404727887ee988b96b9fbb3a64a57b5b09558bec9efc1559dbf0116b30
font_02_sfnt_off00012719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12719 17780 bytes
SHA-256: 26b1c326c5facdd46eb131e0d5c330769eac762085dd72ffe3262dabeec4869e