Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ad6fbfaf5e3f7d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 19:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a82a6d1de3399709ce839d9aef3d8408 SHA-1: 27981f21a602bcb3e9ef9ce32c2f48ff40113ba8 SHA-256: 97ad6fbfaf5e3f7d3e91749e324f65ec51cc6bb551f0de9ee5b8d07b51114589
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also includes numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://sibservis.com/ckfinder/userfiles/files/47471728629.pdf In PDF document text
    • http://nuuts.mn/uploads/assets/mapukijeromavepib.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/5246959473.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/vudukurakititusozi.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/varozawubusaxatekixe.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/29360870.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134a717582e6---71733583294.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/temodijifanegexig.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/13490428807.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/vefuroxo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301c488d41f---guremekixagudezasekaj.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xuziriwavowadame.pdfIn PDF document text
    • http://hoachattn.com/image/files/25253147541.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/fovulovawus.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/44123373978.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/muxevugazisofo.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/wamutaladed.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/nibadejiforitok.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/23560421379.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/7111050989.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/29963719836.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/95215125155.pdfIn PDF document text
    • https://miet.hu/kepek/rolunujilewotedukimo.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/egk0e9q3eukep0qmnctbet7acq/nonininanirutefotutore.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2245b5049---48143565809.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/27366621004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=key+indicators+of+economic+growth+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_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 11212 bytes
SHA-256: 499153021fb3673732a0da6ef7a9613cd0d836e9a82ee84467865777029be9a3
font_01_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 18372 bytes
SHA-256: a07d0fc158a0a2efc7f65a5c31302745d7c3660c8ef8a00151a2745d36a1f5dc
font_02_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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