Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d3fdf3546de30c…

MALICIOUS

PDF

77.3 KB Created: 2021-09-06 00:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57f248d4a64c339cba48232ae184df1b SHA-1: da4e2f6b7525aedb2eab7050d5a20b51b538a07b SHA-256: c7d3fdf3546de30cbd0d524a70fdd2a8c12b2b73d7f6177a6e3ed07a10cb4017
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple links to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The embedded JavaScript and the nature of the linked URLs suggest an attempt to redirect the user to a malicious site or download a second-stage payload. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://transilvaniafishing.ro/app/webroot/files/userfiles/files/83958526791.pdf In PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610a72f5d7909---ravuxaruwijijinapigonof.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607abce20e4cf---38233392324.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/86122817938.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/27981116571.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/18928954388.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/redetafuninoniriga.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/marirerogazijabe.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/t76q1pq9ie1cgb96qd49f8at75/mizekososazojanepijilune.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3ea0ac95d6371f1703f5f287993cb8d/77188732330.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/kotofuzazes.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608adb191db1d---66186455301.pdfIn PDF document text
    • http://kbchina.de/upload/59390632137.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/62493673804.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076f54430b47---luzokazimazogexajovale.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/nidoxusokoj.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/jotub.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/50032705413.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/banitarir.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/64575324883.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/jumefeludololofomedoweza.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ladrd1kihpm30o58k3e2ksbk2g/98969393997.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/66d32f0cc1b839c5f0ebeff8d95494f2/bakipibuvutuvisuna.pdfIn PDF document text
    • http://abnicum.com/files/file/damozumajavatagefadapovol.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/fetekawi.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/magexopakalufi.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/zowejodikeguvuforazomiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=commercial+aquaponics+system+design+pdfPDF 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_off0000c9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C2 11352 bytes
SHA-256: 5455d8b048f7a81788346120d3f3cb1e15286fb133562e89aa88af45e93e8742
font_01_sfnt_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 17076 bytes
SHA-256: e40b32fabc0fa56d174ff9d897b059ff3cf4dc8a5f59f57819f7daf7834a497a
font_02_sfnt_off00010f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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