Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac3489a2220d144…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 03:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 22e6694786ed8de73f533b9a227aaefa SHA-1: 5b10c545963a1b7bbf4331a68c87c931b56dca0a SHA-256: 9ac3489a2220d14457156cccf87dd3344ed63d8ebcc724b8be9d4355522fb121
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=aliran+sociological+jurisprudence+pdf PDF link annotation
    • https://maisonforville.be/documents/file/zejiwa.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/kufokamitozapuxajusapi.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/nopipoganutipomufut.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/diputakefumigukikugakel.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/toxirobikukaxepevon.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/90221677537.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e7ce7f60e---notazug.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/modirevasetafawonu.pdfIn PDF document text
    • http://www.swiftsecurehosting.com/rsnpromotion/siteuploads/editorimg/file/mivozu.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/14527216764.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/73349055774.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/sexirubofuporipofuteg.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d4e2890b768bd01d4591876ab796371c/gowirasel.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607322056e382---kelugigib.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607acaf0d6bc6---nesukubenadokezozafi.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/30310784152.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/fojagijemaza.pdfIn PDF document text
    • http://artospace.com/pics/file/11465377426.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4996078d75b524db992d42f0aca67e91/84890599998.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/73ef36a3d2458f4af1bcb8386a6f2f55/38638333182.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607775cc2bdbe---teximimulizexomoxuben.pdfIn PDF document text
    • http://mextro.de/upload/files/74577485053.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/tasarosekemowifoxuz.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7e2f5520a1c73b575f73cb90ba5a6bd1/5121797906.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e07d9950be6c674cab6ac701354385cb/borugezovuxuvor.pdfIn PDF document text
    • 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_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 10908 bytes
SHA-256: 08e26c9a1c67516a24999fcb9535dd3480825eb0ab50e97cbcba9c7066003ff4
font_01_sfnt_off00010122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 17696 bytes
SHA-256: a2beb9d1b5edb0c2e9b3f9967d3fba4ef859db27644ea655825b3604464b7ce6

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