Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79fa593429f9d86…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 13:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b0202c19954a200bd73d91b26ee99fa SHA-1: c8572ea9a2a8f4368451a996cfd7351cbeaf05f0 SHA-256: f79fa593429f9d86cf3f6cb86e991cc97b5e87379eae742ab5620a44c023dab2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple compromised CMS upload links and disposable hosting points to a tactic of using potentially untrusted infrastructure for distribution.

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://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aabb1f44b2b---93882344969.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1f80519f---reneguragaxizop.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/67cc5194382ef68352b1b0bc7aa8bd23/puwomipuxatukozezidetifu.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/qr8feftmqskotsvjb3rrn4n4if/tujokuwugonepikonoxesi.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608734b0adddf---82980046425.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/dapulewipadopowopudarawi.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e10f921d67b---23613865600.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/99004192944.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/90312937781.pdfIn PDF document text
    • http://potlista.com/file/files/7600092195.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/folufopadovenupuzomofep.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/8fb352728b8a135137f686aa8808d192/zurukokaja.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/pasavod.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/98467299185.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b06a305a9---rabokabasu.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/fubuterevewogavifo.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/75059770754.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/wulironaxozorofobizopozup.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092965ba63ba---69350937542.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/882ea9f356989e6e9137918296b6835e/25861874552.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/39206423464.pdfIn PDF document text
    • https://sealskinz.ru/files/file/wasube.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/81980397571.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608a519e46a44---8752712115.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/79234730310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=modificare+file+pdf+con+mac+gratisPDF 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_off0000e3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A8 10956 bytes
SHA-256: 564a1257721cd152f0f105c582dc263097bcae74a858853d2703081d13fdbe2c
font_01_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 17492 bytes
SHA-256: 2f360f9331ae3dfe15258140c9dad1a773d9c2598a22a5a78851428cb9adf1ee
font_02_sfnt_off00012a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1