Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed68c4b4d1a12b27…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 14:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 66230dcf5f1a52ff13ce2a39bc9d0318 SHA-1: 72d741fff27c935914526b1fa3f624b54e043f29 SHA-256: ed68c4b4d1a12b27fe3120b9b689e5e2338028b903106c9cfedb50c565c645ea
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised upload links and disposable hosting points to a tactic of obscuring the true malicious destination.

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://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/56a625a3531bb5228a7662a619e986ae/20409191993.pdf In PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612361fd55f25---bekepozuzevixol.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c6f2cceb---lesiwevinunojipuda.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606df8067867b---vaket.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/xewopiwomukipovurevi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9ebc3efd---71284239840.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/61715867967.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/30001224845.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-8-29/20210829051403998096.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/34137952479.pdfIn PDF document text
    • http://geraldinekilkelly.ie/93477847390.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b5a7d36fbed388d76c0024e4b2f6ccf4/65350400959.pdfIn PDF document text
    • http://eternaseguros.net/files/files/namizuneribosafoker.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/vuzag.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/bovodepozez.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/9641832842.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a7853f230154637efeb39997c9eb336e/tevotorazepibilezevo.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/444835566.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/zanov.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/levasizimopu.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609afd191ddf6---25003174439.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16117c973e64e4---97063537878.pdfIn PDF document text
    • https://anakmeong.com/contents//files/35833380613.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/jndl7vncq44cj1mnsleivufv51/85517176387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=compound+predicate+worksheets+4th+gradePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 17316 bytes
SHA-256: 4c2ecd40d6c628fdebc350932a8708f6113f990b0b740923cf223ab81d50c438
font_02_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 11300 bytes
SHA-256: 2a1a22fa8cc53182d38a035fb11f3dc6f4eca5d4bc8468a65a202b3dfdbfc8b0

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