Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc4d5b7fd7ef32a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-21 13:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a138a0687d0ccfa1bb0d9be3e45a6c5 SHA-1: 1124aa7379a82787de954ae158b315e49b08a96e SHA-256: bbc4d5b7fd7ef32a3118ad2303f659083665025fba43c0ade62cbc2e3846a2a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to potentially compromised WordPress sites, indicating an attempt to host and distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e63d5a37ba---gurezatomuzomomusu.pdf In PDF document text
    • http://amadpich.com/userfiles/file/zibitidem.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/zizebirukodenuwizopipenud.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/didakopigava.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/41128691776.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/najojirewodezufur.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/97156654361.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/27674455622.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/73299245923.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/gekenowutukorerusi.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/poziwukapitipovenop.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/21065956839.pdfIn PDF document text
    • http://lovesenergy.com/file/rijenelexafukipefumeranut.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc2956167---pevimikupumugoxoju.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/jefinuzotelijisexuwu.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/5431654781.pdfIn PDF document text
    • https://forssh.com/userfiles/file/94645464994.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/jumati.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/73028348968.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/nopoxuvomaji.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/saritamamudevupepavak.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7cebd2fd---9581103522.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/66888043007.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///jakunamubajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=online+tv+channel+app+for+pcPDF 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_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 10500 bytes
SHA-256: f595cb1f2e6248522e387bcee017d157cbacf0725295c5429159e0e52229fd99
font_01_sfnt_off0000e9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E8 17816 bytes
SHA-256: 67387966f48f7eeadcabe528c7a0275f0bb33445766579d33fa25fbb112af533
font_02_sfnt_off00011824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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