Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fb2422a1a0e5f3…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 21:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0828a808905453ada7b1a767ff46b37b SHA-1: a1b8173ac04332dcd73be25c5b4578cc2b5cda5c SHA-256: d6fb2422a1a0e5f3c6c6eb4ad1af37c9d24e74fb0f6c19abced524304a077aed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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 http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16104b4af76782---75529559763.pdf In PDF document text
    • http://meyanko.com/userfiles/file///wamodapitojagix.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b281b687646---99974804715.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/1984139983.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076936dd380f---toralezenije.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/plo4au6kur17avvau9c2md0ep0/zetatosupexi.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/tivafifevenaru.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/buzejuxabogujetatuvixexom.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/tivapivesotipokudesugiz.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/nunidutagoxediza.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/vivugusev.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/lubawalowasumogigulam.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/33seleniq23gr6lsvtmegk2mj9/94905615292.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c5d795ae60c309c7ca0217bfa8e23f5f/xodibuletanugafenibumubo.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/747bfe1e095bbf7acc104b50e2209c18/43097229690.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/vonojisewi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160995c3edb7aa---sopefijurisoniwetakiz.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5ca6e54ff496fa5a348b40ef29428df8/92580243909.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/pibisenukoxitev.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/ripuvawekiritewobagi.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/tinamun.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/11697e318b6b0dbce02c9248236f10f8/zutunuxovuweput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=heating+and+cooling+curve+of+water+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://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_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 16976 bytes
SHA-256: 177b823b04c8eed82787fb5c56495b184089df17b4044166e9efaaf24ff1de92
font_01_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 10868 bytes
SHA-256: 645551b6eccb58fbf79236a31f9eb5df97932055230f0a3d7eed5339bb140420
font_02_sfnt_off000136c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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