Malicious PDF — malware analysis report

Static analysis result for SHA-256 abef2c1076c669a2…

MALICIOUS

PDF

70.9 KB Created: 2021-09-05 09:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3190f3481145bc64a115dcb9b7018d17 SHA-1: 8f7ecc52d0c3dad1ab28bcd72871c7622352dbf5 SHA-256: abef2c1076c669a2d207f22b9298830cfdd0b431da3a6feb9d69836253eb6930
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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://accessprecision.com/userfiles/file/newifafobanuwabifa.pdf In PDF document text
    • http://pass38.com/images/contentimages/files/wejufunu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/93o9p6ejtrsl5uajio1m5gu6s7/gotejopejefajepatigugugo.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/64337059596.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/mupaxelivefa.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f76288b2e5---84892038885.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/21421462120.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/49bf718fa3ff78c0b44469bcedbe8749/sulexubefekinakaguxem.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/fudijarajo.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/65538512996.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/mejokutotajowa.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/49570510803.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/lejisimitogowizuxa.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/ruvumanejufizo.pdfIn PDF document text
    • https://isosklo.cz/uploads/roloxizibezulavoxus.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/wamowiravejetev.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16129f3c8d99fb---72656134679.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/76898359069.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/6irljjbct2ffc7lsb5qsiivu11/woromonejixokerinigasuru.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/89162952726.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/3n70eqhe2593lk8f0shphmm6b6/jijejipaka.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68dc36fd9---biwokofetuw.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/35262292851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=adding+ly+worksheet+ks1PDF 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_off0000b5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 10692 bytes
SHA-256: 94bb7a12057af31a10d76d4bfb14d87da8946f0ccb83b4b2abe8810014b515b7
font_02_sfnt_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 15628 bytes
SHA-256: 01ed41da298560c13bb561c3046131499360412a7cb7b72e9726f31d747aa5af