Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5b83eb9cad976f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 13:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afbce61387d0dfed2c8700724e3212e7 SHA-1: d4add99ecee3bebb5d2186fd1329bd73224dbf13 SHA-256: 5f5b83eb9cad976f117363fb596e91f7c55252f913ab6c269b6ec1d031591878
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including a 'Recovery secret / private key request' and links to compromised CMS upload storage. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lures suggest a phishing or credential harvesting attempt, possibly leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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://vasutaszeneiskola.hu/ckfinder/userfiles/files/xudezijitedujulepuruwub.pdf In PDF document text
    • http://marikitaberbagi.com/userfiles/file/16110474519.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/836768668de0786e187beea4b2209cd4/32110811655.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/latugobevosexezesad.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/widawexuxirumafe.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/luwafubi.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/fenenopupenizokunifisa.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/40643773859.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202194457257737.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/pakamibulimigesupufiwil.pdfIn PDF document text
    • https://ijpdua.com/contents/files/77714923303.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae54a5dbfd---94408414096.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/35754686244.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135987e2affd---naxexolunaxosewojolukes.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/13567102187.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/80296131000.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/74884206864.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/roxiwokubagonebak.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/kabikoxubobojoxazikekuj.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/27777686338.pdfIn PDF document text
    • https://renetravel.ro/images/files/niretowapipexogu.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/bodawobapo.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/cc477890461820bf4edb3277df0ebbfd/pufavubozem.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/f4c6acb4b2c4e50a93ffe8cc9288795d/bakeduki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=telegram+web+series+app+downloadPDF 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_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 10824 bytes
SHA-256: 6d75e258af6d7bff530403b8d261bd8253a61a8fd64bec866575e40424e0a56d
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 17188 bytes
SHA-256: bd4695053aeae72ab4772881e681665ecf5ad05fec76e3f0ab1b8600a1111bd9
font_02_sfnt_off00011fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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