Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb87a0341057065…

MALICIOUS

PDF

93.8 KB Created: 2021-08-29 06:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 933ea952f9414e484045bbc6a8ada321 SHA-1: fa0cbc2e5b5e584849a162053d181df3e6d4becd SHA-256: 5eb87a03410570655bc1cbe0822919e8e1189d1dd990a81401a2af956e1ea205
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV both strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple distinct hosts and the use of disposable hosting further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781ea22924b---badijokovudi.pdf In PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609fab22467e9---jixazitawon.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/q5bt4oe9are6u624gsf51diski/titavoredigevodanokegem.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/xokakodopa.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/23708597435.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///52441485889.pdfIn PDF document text
    • http://sbcnepal.com/images/file/22707116260.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/bakogituxak.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/savuruk.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202168024165157.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/70403c0bce46cb5dd1b014df01a6d466/74757945986.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c09e06c10bc---9255709431.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/bf792754a3e2bf053b002e0265b521c9/17711815624.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ajs65vdem47jv9mpaer1gkdkpk/bajufem.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4cd46f7d54ececb404b3461bac02bc1f/35589858317.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/xibotugi.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/gusodolexi.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5ad6fd66c65f45a02daec6c3f77f753e/xosebidowodonit.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80b8a05a9---sisegud.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/65751143234.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/febokawurexepexuj.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/21976565417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=signs+of+dog+first+heatPDF 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_off00010af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF6 10660 bytes
SHA-256: 59efb56fed78f7ef700d2b41d93386d71de4ead4eae58fcd235f1153147f6804
font_01_sfnt_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2B 17924 bytes
SHA-256: 374a5346b68e88fc3357ccd1d76643ec1f361496ba8ad55be0e694c6c90a5ae6

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