Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd772bae2217589…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 09:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9d30ad90c6f320bc1ce484fbf778f20 SHA-1: 5ea7a811405b7843def0333d719e93cbb2dd6a12 SHA-256: ddd772bae2217589f4a8ffb2fdb98ed66cdfedb18fb73a51ed5b128a0b93a7e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to potentially compromised WordPress upload directories and disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://freeorden.com/media/file/69925860123.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609483d55d774---67821421944.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/96600163050.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6f4ac102e---mibagiloxas.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/23798456895.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc1785cc38---11210097747.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/sakixoso.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/dudowetisipusidep.pdfIn PDF document text
    • http://saxons99.com/clients/5/5f/5faa49e4155ddd0d4faf97b0d7aa3dde/File/17296875854.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210728092840409.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/52716559701.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a92a664ae6f---febizuburugotuwadiji.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/954ed52d2eeb06369145c465cd0d32c8/11017912957.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf9c9b5715---75663781452.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/fapemipenemefijere.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/jolibas.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/43184068038.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/7793218462.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/53711002525.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118e83d54f5f---91834370691.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a20e1c357---50070576156.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/30624659977.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/3a9ec5ir4m8l06fe978k3thnt6/54655641274.pdfIn PDF document text
    • https://ijp2.com/contents//files/23355897870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=coaxial+cable+definition+pdfPDF 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_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 10620 bytes
SHA-256: 8e74f56bfd7d5de80c1bb8f88de9bbf946173851c320d8ce3759b4d3b44c3f42
font_01_sfnt_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 17744 bytes
SHA-256: aa433eec7bbea31091f83b5727905623c73944f4a50d3acd405066c73dfef742
font_02_sfnt_off00012856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1