Malicious PDF — malware analysis report

Static analysis result for SHA-256 3022e19fb9b1ddeb…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 08:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16949aa389be5a2fec965b06b63d55f3 SHA-1: 376c871dba231ca9d6165beec88994b41ae1aa65 SHA-256: 3022e19fb9b1ddeb041430008680cd6753e7e6210fb067363fd282ee1e712d3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of external URIs and the nature of the heuristics point towards the document serving as a lure to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gtijsr.com/userfiles/file/79606683240.pdf In PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/t3sugs5elldfcj956nbrrvv42m/lozovutamimafav.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/dizagipowijavawulavabixe.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/eb4e9050da0d416d7efa241dde0a71b5/18309549956.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/pebisotana.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0278eeba55---54143861590.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8214d98ad---78670908278.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/dewenubopumesizet.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/3thdekvi7osguvk1skoj0gn5bc/rilisebele.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/652218f27eb2e635add01cd319d18bbf/35047418539.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/sonozexukefeligep.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/6617279893.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/fiwuketebemarilaf.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/93967027209.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/gigizerusuwovitiron.pdfIn PDF document text
    • https://people11people.gr/uploads/File/fodukufolixojudapubapum.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160905ea29a189---surugulagubifelasete.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/metadodotegawemapinil.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a352c82d---9503633636.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/50193423795.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608082df5ea51---kezifipimewataw.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/zigepelitoxitinunub.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b032499da2---85925702701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=story+reading+for+grade+3+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_off0000c107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 10820 bytes
SHA-256: a0b72ed065ae1a120d353392ee628e6b9d7d74a25a1f6e1a7da2b309212d6371
font_02_sfnt_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 17776 bytes
SHA-256: 979b21ba53d84d5cb8a8f4fd52c18b6d1f9fe0116a475eee93cb1f443495d961

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