Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95735f57085f65b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 19:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 698e13bd3d9275ea0e00ea902d938a99 SHA-1: 5f7230374ef171a426dc8640c392fbbc9a58960d SHA-256: e95735f57085f65b953075db0ecbc1852a58671e98f458d2936b649b29cefacf
196 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, a common tactic for distributing malicious payloads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to evade initial gateway scanning. ClamAV detection and ML classification confirm its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://bda.ch/ckfinder/userfiles/files/xatuxavureget.pdf In PDF document text
    • http://mail-ex.net/userfiles/file/5173213685.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/famozawuxadubi.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/jinifafukurad.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161353eea10fc7---detixan.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210902_023556_6770.pdfIn PDF document text
    • http://koddous.com/userfiles/file/fikowijagim.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/zedizibizewinifoz.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/98644119940.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/wagumarasuza.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/29716260626.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/5623843506.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/senapopiroxubevizi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/t98no2og6lg9tm7p86thbvq5hs/12000885385.pdfIn PDF document text
    • https://afma.pt/site/upload/file/13992970808.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/komevisuzalaxeb.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/81081768788.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/97769374077.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/73068793792.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/palidamepux.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613702d8cefde---13616375079.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/76390143490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=gta+5+ppsspp+file+download+for+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_off0000dc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3B 17888 bytes
SHA-256: de1b8a7b094aebb9419ca7f64f9234e1fe08c32a2bab05161777e029fc9ca3ca
font_01_sfnt_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 10748 bytes
SHA-256: 17e05676799e328ef83b1844bea0382b9d58fdd1e8e95baf0f805e40bd669d15

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