Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac598907d71e301…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 09:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16ee99bf637bf65c287b9373d77ab21d SHA-1: e19b44c5c560c2e2402554f5230ded3d8abd20e5 SHA-256: aac598907d71e30141a4c04d8c48f73634c11f12544a13588f35a9f4e5f1a137
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users through a link farm. The embedded JavaScript is a common technique for executing malicious code or initiating redirects within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://makaroma.fr/upload/file/84351343799.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613414d577209---29913089895.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/jiluxi.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/83952252660.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/15699515987.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/sodinonexesiwakudusijo.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///jisokorinomabifasarofezi.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/dexuvibipatesi.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/73919217264.pdfIn PDF document text
    • https://funbugs.ie/files/file/pimikoxetefu.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/vigabozawaxexajisorowokis.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109062145238349.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/67057322252.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/fevewumonanizasav.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/38f75ba57eaca7659cfe9fd117d5719e/38312775042.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/8180434d5650228499981db53c027fb9/jezifiner.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/zumoxew.pdfIn PDF document text
    • https://bczenekar.hu/files/file/24674811307.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/jexopiketedenamelozunebuk.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/karibepesu.pdfIn PDF document text
    • https://greenways.at/userfiles/file/malutaxafu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3bd2b70b8---nezogozifudagefedudikeli.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/refadexubuma.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/vomatasofomuneponekenolu.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/zuxinobeg.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/ririt.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=samsung+galaxy+young+duos+gt+s6312+games+free+downloadPDF 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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 18184 bytes
SHA-256: c362322e2e7c55f819fe9a311e656d2664345fa9bdc2ece3de7534dc99bcbf9a
font_01_sfnt_off00010c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2F 11592 bytes
SHA-256: 6bcf0b41783e39784f200a1dca639f38344ae355b6468487358f4c301d31fa12
font_02_sfnt_off000127c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1