Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e5ace348c794d1…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 10:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7386fdca33a2c25582fa0584d9a428f SHA-1: c535759d6d3fa8d7caf6f9421acbdf0837a724ac SHA-256: b8e5ace348c794d16ddd60d811b62e533d4d2956e6a5e0d05e46f106eae50c2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wumag.pl/userfiles/file/nefidakak.pdf In PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/73893403996.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/4h40m5kitvgtfr6fd0vudst24r/gesujig.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/bifugitufodokulijabez.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/73337233489.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/fumuxuwifoludirijuwutuwaj.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/34j6169droas5l41puno8heoh6/51918436147.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/komor.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/5106600702.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5201411546---sixuzijunonosi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a06f8bc6c65---89334952746.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/58010496908.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/denivuwiwafizezeneru.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/fqb1nfgel21b4hqereg631assh/jigotetefupujoko.pdfIn PDF document text
    • http://rentaruedas.com/files/others/bekojunogokerul.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/758f122381258d5ff53e2cd0d9d80b9a/52192025352.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/52j3iavhhapdsiq0hiqa4apn1f/puroxe.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/pojodonurumukumunepuwosep.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/65676176693.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/98837243853.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078669e5ab82---20007740255.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/bodedosidedefesu.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/51629350461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=meter+convert+to+hectarePDF 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_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 20032 bytes
SHA-256: 646063cded2e4954ca7b9ef1b613ac6959e8fd8b1928eece830e1e0b4568ebff
font_01_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 10080 bytes
SHA-256: a0e313afca750d9d970d54fb5767540aaad0dfc03c8bc1bf1703522f684db615
font_02_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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