Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4832fc9371e3efd…

MALICIOUS

PDF

99.7 KB Created: 2021-07-25 22:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f6f5421ffc2281da3ab2c3131c0ace6c SHA-1: 72994a19c7f26a11b76ac9a310bea326c7342ad9 SHA-256: f4832fc9371e3efd54d6695af3acb13a07146535b2f9b7a118681bd768f2b470
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, indicating an attempt to host and distribute malicious content. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading an encrypted payload, which is then likely decrypted using a password provided within the document itself. This pattern is commonly used to bypass gateway security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7483c64d168a5f89d25c518e3ca90785/22006435220.pdf In PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608172bdb4825---ruzuvekujo.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/16690641020.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f6aa5bb67e903cf33da1dbb5b5ca3070/mobugaliva.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/48552765463.pdfIn PDF document text
    • http://innotack.com/userfiles/files/viluvavizupajivomolepam.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/lilegeliwanatipopoli.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/9vgt8dvmgbnua0bql9nt9u246u/96381889064.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/423dc793c3601c1f56402d624d1e532e/febivijaxavozotowug.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/11422960796.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b5561d099a80d3cc2d3d76fb62313240/dikivadoluzanobejuriwup.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/detosijanolevimex.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/58410961381.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/vqblojj519tnokncg282f1b6ql/30580343406.pdfIn PDF document text
    • http://tjclassof1971.com/clients/1/16/169b02496b2253913efe31a5b05f4f66/File/rowemuwetigaw.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/iemucrqek2nh364cr04vuv4gc9/rumavulanug.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/nidupijipukokop.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/41f4088c904ab963e516520dd0719562/gosolenifibixuwodexanorod.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/cd969e070c1856d433810e6f2bc6bcfe/fogefazovumejabulaxox.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/nefezotopuxid.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/24f8dbfbcdb84b1cb463168c17b37719/21420810180.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d82ed9e55b---wexesavasuwuzomesigewoti.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/47789601728.pdfIn PDF document text
    • https://kede.org/userfiles/file/poledowulufunimoparir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=descargar+juegos+para+xbox+clasico+gratis+completosPDF 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_off00011cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E1 11084 bytes
SHA-256: 670a03cdc73f212aedda1dcfdc5dd5dcb90f063d16c974403f37852a1087a767
font_02_sfnt_off00014e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E93 19320 bytes
SHA-256: 43ef47d9ed4b877c65e571941f126118f65ec344c63deebcdffbe982b6a42ff3

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