Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5340f9abc35e07f…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 03:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c589990f43c007a97328f3b8589d37eb SHA-1: 8c0921c1a99bba1e24bc75c7fe207a6ffbda7723 SHA-256: f5340f9abc35e07fb6ae5f3e08e204e804e49ed13f93adf80f36b1a7e9022ffd
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 WordPress uploads or disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and embedded links suggest it's designed to lure users to malicious sites, likely as a first stage in a larger attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/08cb777c891a6a5339a6391e63f92c3b/poluta.pdf In PDF document text
    • https://ourlady-schools2.com/userfiles/files/sanodazevuvakikelolefi.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/281049181830.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9d7e50898---74163608297.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/68009b0b4cd852ff964409318670e088/40205818004.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/36166439793.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/mumoxoxigoxumezol.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3a6262f7.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/pisap.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/06/202106281124447300.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/botefepesenikaliruxirafe.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/dkp87oh7r62j1rma9oobon0nnu/kizesenolijimijesuberisa.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/zetiv.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/57825411437.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6218d65b5---numedafijilosajo.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/a57321e36ab2ea2c857c360644f9b9d6/35413572781.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084520f5c8df---faparunabov.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cdb938b0e7b5975b9a7499a707b82aea/56474965051.pdfIn PDF document text
    • https://motecx.com/images/file/6007601740.pdfIn PDF document text
    • http://gojjang.com/uploads/files/forofimuvelur.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/samiwisigajoveba.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/84396445744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=shasta+county+courthouse+redding+californiaPDF 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_off0000c71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71C 11044 bytes
SHA-256: 3c0bc08c51a7b8d0f7caefce8de09b767c59e62c6e4e6eb8dbcbeb8107f53b37
font_01_sfnt_off0000e093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 16352 bytes
SHA-256: 58365c4d9ce32d09a28faf8785a3243ec7a910169edd907aa54b2ad54068f6ef

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