Malicious PDF — malware analysis report

Static analysis result for SHA-256 44454fd1335e8ec9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 08:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0d37dc0b5c289658de7e0b5bf64e459f SHA-1: 76f8e19cad32fdb0fbb6d8207a891f7218c3756d SHA-256: 44454fd1335e8ec913e7813d0690b22fa155662bea3211e2c969fac5f721b203
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a529d9de991---64231491825.pdf In PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160744bdf7c24c---maselojuruminebipemozujip.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/xuzunoxiw.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/38295960684.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/46528546621.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/55051347653.pdfIn PDF document text
    • http://allycatering.com/userfiles/62955206732.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/61014006215.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/tetnmjppqcvn0gq7bnrrjou7n5/vavazaja.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/sanagavukovuvoguf.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/99845238732.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/66375388143.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/tubadavewafidomevuruletud.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/gowazaduretipimotixupi.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/novifulewutebovovejegiw.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/h8vk1b5305mutroleh33gp1vvq/vokup.pdfIn PDF document text
    • https://argumentua.com/i/file/57809371425.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/3f9882cdae1125967eb157763e1ba468/27720217414.pdfIn PDF document text
    • http://aliotoconsulting.com/clients/862286/File/tidozafawogorar.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/52400081481.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/20fc726db50529a915a69d616743be81/61864699543.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/motelimigusoruwabajebeze.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7a5834820---birikugukezalubifebimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=diferen%C3%A7a+entre+asma+e+bronquite+pdfPDF 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_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 19504 bytes
SHA-256: 61c92a7cb783e255c2cddc8a1779be516f4d3cb6d5817208383ba4de07f5ecd5
font_01_sfnt_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 11196 bytes
SHA-256: 535939153e3ea90d074b22f49cbb69fb28b2560aa4b620be16f0e3a2206f0b29
font_02_sfnt_off00011f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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