Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dae6d6819ded93c…

MALICIOUS

PDF

87.9 KB Created: 2021-07-02 10:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f71b2cb0c1221ee0afe8a72778883fce SHA-1: 8b1f7a546db4ec038606f4213c64f44bcf680ca0 SHA-256: 1dae6d6819ded93c4683e82f1c114460a2fc1ad0d1306ae83693e2b420d578ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users through a malicious attachment to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/80b4038b8ea2224318d8a83a63377171/bewuwofusakekepirigus.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/aa1a7sk8jdbsep6pi4i2493js7/645522127.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/68804060708.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076976366e7c---63677181268.pdf
    • http://russia-ex.com/timudimar.pdf
    • http://deltastal.ru/userfiles/file/gutefiwizekax.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e9e21f3b13984c83be6541dc6eb81af7/nosevixubokap.pdf
    • http://www.contal-farmer.com/uploads/files/85621142280.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/02na3s1vdqak2ngrkppip0gjr4/desajuwokaniguwexa.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/333f930b9882d2d787f2c9e30e3a2a11/tonixo.pdf
    • https://torgradio.ru/new/files/file/60429287709.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16091e544f23a8---zerijefofosifuludotezo.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c3b4db342---zularufowirexuwonad.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2f5de36a0c79f06137f5ca224e16e2a8/8532367643.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160983499dbe9d---95867846980.pdf
    • https://ngonluathan.com/images/ckeditor/files/losaburuxitiruloligopo.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/52c826874b8831a8935f4378ae6cd05a/61006015292.pdf
    • http://garmagostaran.com/Upload/file/80892950143.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d3f55e5acba3efab5c0ccdedd72f179a/xatelu.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074182fc44ec---disagosowobiguxoxes.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7cefb1c7d---wegisapomebetedapelenefag.pdf
    • http://talleresjpg.es/img/file/6524961079.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/b64f2e22cddc7a557cf26ca35ecd2366/girew.pdf
    • http://kapalishakti.com/ckfinder/userfiles/files/28364798596.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+a+scp+096
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d5.bin
9f3aa59e65c4f2eaeeb8c236e6c3b618c60f821caabf42b0b0b2dd70f19cc72e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 17376 bytes
font_01_sfnt_off0001213d.bin
8df34b36d4f362dd68187c98a856d400ded72ead470af1f04998b22b0c898b16
pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 10420 bytes
font_02_sfnt_off000138f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138F7 16792 bytes