Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3854772d202210…

MALICIOUS

PDF

90.3 KB Created: 2021-07-06 07:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a69e640444600698212aae46573c6f4 SHA-1: c0a500fd9919461db3a626ec288fce43ffea19f6 SHA-256: ef3854772d20221040c16fe0ff72f64fb3c07fb1c233886d8cb5586e64455a61
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be to lure users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://dienvietbac.com/uploads/files/navemituganizazubogi.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a37dc8dee25---4804343266.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca8e03ee9---33390962893.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rn8bfbceflo9ebk5lvr36smda5/97475002736.pdf
    • http://shreejians.com/userfiles/file/gifusafejox.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8e9dde57---70105097776.pdf
    • https://mariellatriolo.it/public/file/10731630508.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d76c027b4e---16569518171.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad38af65b---bopolibagemubikenim.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de26454e47---zonevo.pdf
    • https://caribemed.com/userfiles/file/40106030264.pdf
    • https://ludifrance.fr/userfiles/file/fijifoduvotato.pdf
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/fanebedatazad.pdf
    • http://mai-colle.jp/userfiles/file/56813540684.pdf
    • http://vmkmsz.hu/userfiles/file/31234341117.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e33d880566b---juzipevopirus.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9l8mhl68hu9kuoteen5408kra2/zaxun.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb6cf15b8---34800160987.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf456d41a---musovinakutotilo.pdf
    • http://radio6deenero.com/uploaded/files/6129586241.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098f4b28bb4e---powoboxa.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160965f770f564---gosexifigixarapola.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160801c4a40f3b---26399910141.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=i+never+knew+love+would+hurt+this+bad
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e014.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 16792 bytes
font_01_sfnt_off0000f826.bin
6356dac5e44dd19fbd98df7d37631146787075259f0c7bdb348f9d7457f7a665		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 16460 bytes
font_02_sfnt_off0001234e.bin
2cb9fdaf3dc13556ff039d29969b160061ee596349491401c5a9dae64a571ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1234E 10780 bytes
font_03_sfnt_off00013c16.bin
128991f5c1439f1e60f0d9765295b5ad66d1b063a9a2765b31b3552cb36eea64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C16 16460 bytes
font_04_sfnt_off0001525c.bin
478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1525C 1760 bytes

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