Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e694d7150a6e65b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 13:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2e024f19015df0271d9f4123a4b64877 SHA-1: 3d6ffb56b7f95b3631c396b03c4499788078268a SHA-256: 4e694d7150a6e65bdd69c31295d46cf67a5c583819879068abc4b55bdfe7cb49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://hstechno.com/userData/ebizro_board/file/morewanawobotizovu.pdf In PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebce0eefe---95582849297.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/nezezirawikuvobufakoxuxu.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/bexiruwarizizunuxumerugiz.pdfIn PDF document text
    • http://test-immo.com/file/bewobelerelawamegakum.pdfIn PDF document text
    • http://faradbox.pl/files/file/58073873660.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/41928861255.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/55777706150.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///zuwipuxalizowavatowi.pdfIn PDF document text
    • http://foodchemsino.com/d/files/91844081469.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/fulirimuwexesaro.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/66011353686.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/51826392403.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/85237886433.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a72c2627a6d94f95a4611d3867248ee0/repasogaduv.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/bumeladamoku.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/84530207889.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea28b84758---giwunelozekazizu.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/67032759585.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/84590966169.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/3b71a0cc5c22f37f939e048f89d0c51a/97565152029.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/gamobarikuxivoxow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=satellite+tracking+app+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_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 10792 bytes
SHA-256: 5c92acf7cd815271aa3db5c6045850becd441ff3a62fcd89ac3bf3859f91074a
font_02_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 18780 bytes
SHA-256: d7f07801bd90a1a033cb5d736433c9e7a011ad3cd10de20cc38ae0b78d1b3dee