Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9b02494498fdc3…

MALICIOUS

PDF

93.8 KB Created: 2021-07-14 00:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6a7f947ef5db91960eb4d65025850e83 SHA-1: b038900826d44963e2d87b13100f65da60eb91a9 SHA-256: 4b9b02494498fdc30e37750e362acec74dcb0f1aaa938f29b3195ba9abeba4a4
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://www.cenlafilm.com/siteuploads/editorimg/file/93713816016.pdf In PDF document text
    • http://sushiloverca.com/uploads/files/mememuta.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/wojemuzivoxebipisimoxa.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/87542099572.pdfIn PDF document text
    • https://susta.vn/userfiles/file/87032104074.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f545c7a84---91009918877.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/59f07adb567ec3564189ea2dc9d5cb2c/49432163642.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/36097395123.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/pesopidelujojo.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/50310858207.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bdf81ca7e2b9a5dba264df8cd545751/pijesoxagax.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051422381573499.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc70c05796d---20785154760.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/12554500837.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160846dfcb6b70---kozalipov.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e4b529a843f58fef13cd0863a23b5bc7/36773408489.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d33b4025317fa2c4a07a3a4518ca9431/jatibapot.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/muzoxokesiwipav.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e2b01a580---13935274980.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/u54tfiv7scrpqg8hkq023n16qi/94563650267.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1c708pqpu927f74foo76qe4v55/vuvowonopetinas.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b475f2d08d2---kupenevowomakajunetof.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/dfecbad043b4ad6f2db0057e11982356/dojolugezifu.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5af22a21---46384408956.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b4155607dee247c233104bc68ed454c1/31214531686.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091d5476ca5e---5553814769.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a60b9b274e1---nijewazupurafiwogodox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=city+of+teaneckPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 10252 bytes
SHA-256: b98c7b14916655522f8402056624092bef8dd8290dcef524986ae348ee98c49f
font_01_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 18128 bytes
SHA-256: 36cf86bd7f5678aeaffe4bf343e98f38ce1acf921eb7411390d8d1fd1173460e
font_03_sfnt_off00015099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15099 17196 bytes
SHA-256: 9c53039036a6f0defa89bb48bbfcd2d5eb2a627be620335e5508503b8a776296