Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5fcdeeddcd8eb6…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 22:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17f984f3abe102f8f57434eb1f965c62 SHA-1: e75fbe77703fd6b2b2bb310245ce8665be2a9211 SHA-256: cd5fcdeeddcd8eb6d35742df9cd9fe9ef09c432c537e905d9668266028b64305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content.

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://vandientuchinhhang.com/upload/files/89282114709.pdf
    • http://studiofapas.it/userfiles/files/33304738633.pdf
    • http://jnejendomsdrift.dk/userfiles/file/tivitagopalajelimo.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cnv49op25gic9nqc1teeo325o0/95180063925.pdf
    • http://www.electricman.in/demo/frontend/web/uploads/files/nerufidelixoxidikebugofu.pdf
    • http://czerwoneiczarne.pl/files/file/rinobojikinikabozojino.pdf
    • http://jl-vacuum.com/upload/files/57907261524.pdf
    • http://pune-india.info/userfiles/file/gisowodogerexegisesupi.pdf
    • http://solamsys.com/userData/board/file/vudunabebofe.pdf
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/29267936234.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136019831f1d---55871875974.pdf
    • http://yoron.net/up/files/97373337670.pdf
    • http://rotarybrescello.it/userfiles/files/95791717811.pdf
    • http://dietetyka-24.pl/images/files/nakuwazufi.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/rtjtcq4vpj7v6pj7qeu3ue73h7/64400425370.pdf
    • https://12waktu.com/contents/files/41342362252.pdf
    • http://otczenacts.com/media/files/17810597615.pdf
    • http://arebiatours.com/uploads/files/vixolale.pdf
    • http://land89.com/ckupload/files/taxareta.pdf
    • https://prawobrzeze.info/userfiles/file/38840067688.pdf
    • http://kokocurry.gm/userfiles/file/dejitubije.pdf
    • http://gzbaosui.com/uploadfile/files/23839983354.pdf
    • http://metafelix.it/userfiles/files/pebululomo.pdf
    • http://coyada.com/up_images/up_images/nomivixuwupadizurur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+photo+background+changer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1F 16792 bytes
font_01_sfnt_off0000e631.bin
393b058328acaeae0f3f0d15f974ae5d38147afabba2d941d917761ba8ce5a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 19688 bytes
font_02_sfnt_off000118ea.bin
2063456c70e6ef9eced0b86df10848ede044a74d26b38c0dcbca4a80078bf11d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 10952 bytes

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