Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b7f86239e68403…

MALICIOUS

PDF

94.7 KB Created: 2021-10-09 21:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 346defd044994837f0eff1290e2d2353 SHA-1: 81c1b70f8bba04c9d48cf0ab421c414893a08e5b SHA-256: 46b7f86239e68403ff4365bf7df25392492e9cbb7484d8e887e61cda0045c927
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests a malicious intent, possibly to distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=how+to+consistently+drive+a+golf+ball+straight PDF link annotation
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/26430072820.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/89539480462.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133fd09ab05e---nomoduzopuganaduladile.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/39378808809.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/gosatakuwuf.pdfIn PDF document text
    • http://gro-felix.si/uploads/mobanuxanuzanitoz.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/99096336274.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/47399712247.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/danutovolufusewogu.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/52929278038.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/83267724435.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/5596067149.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/zesenes.pdfIn PDF document text
    • http://georgecourey.com/fck_user_files/file/finifometonepujoxuxet.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/febawefulepiw.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/19735553772.pdfIn PDF document text
    • http://clickvay.com/upload/files/11084048340.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/30709459943.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/20647171573.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/59192607888.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2113555bb05eccfffe05d8f69fcfc4ea/mozoxakasatudoguni.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e165d6ced0---sebotaroj.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/lamanevarakilopes.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a649d48f4---99903830110.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/93787670049.pdfIn PDF document text
    • 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_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 11152 bytes
SHA-256: 005d00e918b57776960c7ffeaec31217eede5e3634b6e11c6ddaa9702f530bd6
font_01_sfnt_off0001204d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001385f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385F 19604 bytes
SHA-256: 1d706487e7b9c6835c6d5dc04d1214d6d2bae5af895042a2ae47cab13b354ba5