Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe3f22bd2661b14…

MALICIOUS

PDF

89.5 KB Created: 2021-07-21 14:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1e249619f72c7eb3c566c5156e4c0088 SHA-1: 7570bb3850b0078292d81b325ca820b76b1fed45 SHA-256: cfe3f22bd2661b1432237fed8f2a309389fc2bdf0b347c4af72289369917e822
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories on various domains. These links likely serve as a distribution point for further malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d2d37126---setot.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2842159cd86d1b73350852dabf26eaeb/70403466482.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/47175641389.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729ef5673d3---kuzivibuwaware.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/82474372304.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b842a103f8c---11243487969.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/ccb18134b09a156421b1c869e1fb58e7/80260421766.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tq3ife2t3dv8npcr04o5tnr9c4/fefowaronozedus.pdfIn PDF document text
    • https://airbays.com/userfiles/file/xixujaluto.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/36d7ea239648949ebc362dfa265ae59e/tiwutukavawudukiromo.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/71286589990.pdfIn PDF document text
    • http://darstin.com/userfiles/files/dajaxapuzozupiwe.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/qcoc6i3ooqnv730q89df652o94/xifimukixaluguborizulemu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc9c65b55---nelimozewike.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/be072d8c9cd559eadb0dad479352334d/watefoxezexezuga.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160956ad4a08b9---dinilokubudavirav.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/99201574200.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e7dcc3a3b---89362393090.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/305795089.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/92198731483.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb4d40acff---zudemerabadoxoruninadoto.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/129e08762b0b0f0e6999af84818fd91c/zexuginuzexiwu.pdfIn PDF document text
    • http://nova-auto.com/upload/19355055542.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/41681797109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=definition+of+multiplePDF 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_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 10188 bytes
SHA-256: 1b0af89e217afc399f0d3e2610eba16b69ee95aa0f8e1fb7658cb1aa8f810a5f
font_01_sfnt_off000114e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E4 16336 bytes
SHA-256: 3af5dad2cfd8161ffb783ff952890567185894710f3ea09913f82be7727f5319
font_02_sfnt_off00013f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1