Malicious PDF — malware analysis report

Static analysis result for SHA-256 889007d692a35788…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 07:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d15beba704140441a3cf728e0f1f4a2 SHA-1: 05fc59e33cb60e6ef44668a0a9bef1eb6544a43c SHA-256: 889007d692a357888a0c3a3eed6bbbf52876e26b1ffb7214a0bd30cea5d8887d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS upload directories, suggesting a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5b7d2aca40378d6de652f0d0139064f7/84418188601.pdf In PDF document text
    • https://contactfm.be/userfiles/files/79032933818.pdfIn PDF document text
    • http://hongdacable.com/d/files/gofidubaliluzifusik.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/67880169716.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/66492878485.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fc40672cd6a---padogulijebuzunox.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/12777178752.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/saragexujubizowe.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/9222a65e1a97520b54a9de7ee2f77965/nimano.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/49708997324.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/nivobejofusugosemiv.pdfIn PDF document text
    • http://zaiger.ru/img/file/17790780814.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a35c2c14d939b86638826aa1522d6eea/keduxiliranakudaw.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/jinegiwinobavodapetom.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/rovubo.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/bixegesurawepuwo.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/97764914381.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a9887e8f4b---22231062631.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/puliguxosasibo.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/20147819624.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4610f61d35---guwusesifikobaxilinuwe.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ti7cphuhuj4nglssmm21tdjlk8/kevakeseja.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e1e8e09a.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ways+to+fundraise+for+charityPDF 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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 17552 bytes
SHA-256: 787d146b8089814f4ea7206ca2bcf091db8cbe565307ba6583a584236b264095
font_01_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 10732 bytes
SHA-256: c6912b7683c406af6689450a6239e220ae124c53fd515e1fac3ba24f3896aef9
font_02_sfnt_off00011dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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