Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a65656f401dfbb…

MALICIOUS

PDF

73.2 KB Created: 2021-09-15 14:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 713ab24c9cbd0cea6d3d48d63fd46c84 SHA-1: 43cc11312e564833fd2550dbec5a9ba4e5ff755d SHA-256: 43a65656f401dfbb874e7e86dca1d08a84b05e7699db20591cfe8187b4583abf
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly suggests an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://infrive.ru/uplcv?utm_term=android+tv+voice+commands+list PDF link annotation
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7aa286908---14059363485.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f110a7637fa47f5557c0a4393318e289/voditewafezeduki.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/budanapebudeleta.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec5cd1f552---rugazuvusunifom.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/26833588332.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/merokadofozelojega.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0ce4602cb4f38f2194435ed07595f429/futupexak.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a513d15fe8---55028082145.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/sakujuxikegifosizosum.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/38533634180.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/10951856372.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/nr1bfspq7fbooq3a7p50kr0ahb/nisafalalabozowis.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/sisuzibeliw.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/jofavo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380f75e642e---jatibi.pdfIn PDF document text
    • https://beautydent.hu/editor_up/77657151248.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/42006322776.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/zagewa.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/75358093638.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/86242570409.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/jovutupixenopakij.pdfIn PDF document text
    • 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_off0000ba6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6C 17244 bytes
SHA-256: bc3e9a41ecb69d688937de2483a62391626bc45c92b22172b8caad572d7c0a90
font_01_sfnt_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 10580 bytes
SHA-256: 46538251b34c90c7460c3b513dac6de887818e5afa5fcb8d80e4d86e6f81db04
font_02_sfnt_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1