Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14593535751fe7b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 17:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d0e2034d1f58487a5be50680bb5c8de SHA-1: 26c95d688162d5673863cdc485df2b0d7b99a7f7 SHA-256: a14593535751fe7b43d4f408e5b73e959dd5d47cd831f9427d23531daade4632
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it contains a link farm pointing to compromised WordPress sites and potentially malicious PDF files, suggesting a phishing or malware distribution attempt. The 'SE_CLICKFIX' heuristic specifically notes that the document instructs the user to press Win+R or paste a command into a terminal, a common social engineering tactic to bypass security measures and execute arbitrary commands, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/802bdde4fa443b3db87b11d410bd1b05/55745894801.pdf In PDF document text
    • http://waltripclassof74.com/clients/8/87/875eff38522a6836d9fda94c5a2b6b26/File/31271643088.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/59019458444.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/6550393410.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/kapajer.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/48856458020.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/dac750b052c1c213a55a5cd66c98b9fc/33982412478.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/p9fa4mmnk8n2rcj2kg4q9ov3ee/19683285864.pdfIn PDF document text
    • https://cecprint.com/images/file/2446419385.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd626eaa38c---1924882133.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5692c3b75f---23049307114.pdfIn PDF document text
    • http://temple.mo/userfiles/file/xilexafivel.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/palezesililowumosigofege.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1baf814079---vexusabezed.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/varogolefogetigo.pdfIn PDF document text
    • http://zatacorp.com/upload/files/34207960268.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c79b2b3674734e88b45dcfb6df75f031/puzizato.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/91965014687.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/57476727236.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/newexajexonut.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jodul.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/toxipamafapavikaxu.pdfIn PDF document text
    • http://fitviewer.de/files/file/tujutotuxezejosevise.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f734ebbd0---92841895295.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/51sh2ebethttf12bi89sifc8v1/76881979332.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/d272ab03a65422c38863657d27d92bcd/kutefegabeme.pdfIn PDF document text
    • http://bliksis.ru/userfiles/file/zadufex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=adb+fastboot+driver+manual+installerPDF 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_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 10804 bytes
SHA-256: 4bd9c98da721440470e9b20c9f2d5cf445d539d3a3f7e997e1a910d3fa69fd29
font_02_sfnt_off00010892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 17196 bytes
SHA-256: 8e08e6fe4d5d2de590146729a3157f6b044975aa4fdb1c19ef4d87550329f6a7

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