Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36427d8ca746cdb…

MALICIOUS

PDF

80.6 KB Created: 2021-09-15 12:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da2bd4640ca9200987bcd5410bc3d2a5 SHA-1: 539dfc3fa06a484f38a0bc51dc4ea6607fe9e11a SHA-256: f36427d8ca746cdb72d0cdb266a6945fc5d97af10b024f5f1037cb5ed5202f82
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing or malware distribution sites. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to lure users to external resources for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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 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://rosabaum.de/web/editor/files/rumapawotobumu.pdf In PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/rifesuba.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf5fb1003---96888636313.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2e022626---82299323312.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/resarilefijuxevaxonaku.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/pulaf.pdfIn PDF document text
    • http://dd-eng.com/files/files/32641006590.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/32967321525.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/6ug8hhrcjkq7i1gllhkah1kknq/19887824791.pdfIn PDF document text
    • http://getvisa.ru/images/File/dezawu.pdfIn PDF document text
    • http://texmet.pl/userimages/file/lusovonudef.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210907_AD87785F60C7C5B6.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210914_6AF4A6A4CE4EC5EA.pdfIn PDF document text
    • http://logicamail.it/draft/media/50104790096.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/gonaxap.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/88638977320.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/69558211914.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/rizag.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/vizakov.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/zulibonevaviwafajopomivog.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/nufajivawulivebekal.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/lepadunawemurib.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/48390859519.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/92185368952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=snap+camera+hdr+pro+apk+free+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_off0000d5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A9 10780 bytes
SHA-256: 8ae526afeae72948ff5b7024e8fc933ba74ee761a6c22fe01cf41d88aca4f013
font_01_sfnt_off0000ee58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 17880 bytes
SHA-256: 47d015e614336318ed418a46f70d98b1360eb1fea0633bd39657ea6ff3bffd61

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