Malicious PDF — malware analysis report

Static analysis result for SHA-256 5801f097a38ca954…

MALICIOUS

PDF

72.0 KB Created: 2021-10-08 16:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 69b380893a15249d3565a3dd39330345 SHA-1: b5c2779e0e86ed42bb3513630fa78965dfadc657 SHA-256: 5801f097a38ca954686a528e8558a5be970876e438d8a8bcbb95c8ca3a9068d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm hosted on potentially compromised CMS uploads. Several URLs extracted from the document point to suspicious domains, with some indicating compromised WordPress installations. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://managhantasala.net/mailuserfiles/file/83655738965.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9f60dfb0---71641803318.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16155968143ae3---nudukugerel.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/gidofagewowopo.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/28990656661.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/66526525593.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/matoxojonaxudigaxodot.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/48688824921.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/wakubew.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/38087472042.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/xubajamivu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a98425e6a---xesizagepefanebux.pdfIn PDF document text
    • https://timavoshipsupply.it/userfiles/file/tilewogaxusodexuseke.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/46353246969.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/bonawigebuguzigajikov.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/44860972799.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/29446221927.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-16/20210916123023306319.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/33556617419.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/bagigiribobufunagoxisaw.pdfIn PDF document text
    • http://matras-devison.com/upload/file/4892050697.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/bajete.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/18330514265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+is+siebel+testing+for+manualPDF 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_off0000ba90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA90 15140 bytes
SHA-256: e8543a5266b76e1923671356503a37db20aadc6deb848292b49c97961f8bf507
font_01_sfnt_off0000e0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 10896 bytes
SHA-256: ba92ae21d23a0fe10528b807ea587487e587d06ed5dffac9395840dfe5197238