Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1051ca9a29b13e…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 05:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bfdabbf0cc77c7afe2fdbba37a771f3d SHA-1: 237ea35d3a3284f70765dd73ebbf31f79522c408 SHA-256: 4a1051ca9a29b13eb0a0d91d62e288f31a86f3221de2233897577f93ce526ac6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, forming a link farm designed to obscure the ultimate destination. Heuristics indicate these links lead to other PDF files, and ClamAV detection confirms this sample is malicious, likely a phishing or trojan delivery mechanism. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7563da70dd---42602904146.pdf In PDF document text
    • https://fertilizerproductionprocess.com/d/files/lukesoxutokir.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/l3r306sndie4gvvrnvqg2orqph/bazidavodakazomezowo.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9cc227ff---majemunapixoxopezawo.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871d2c0cf41---26890579093.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/41087002957.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/kasexatamefa.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160788c1c99b45---88173853313.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084edc51e0c3---xedefozenamitob.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/sabovaxironobi.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/jarozefukif.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3a182b910---87049746435.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/44125458978.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/fevigaguraterabebo.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a890f840f61---velizunuxarezeguxidew.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099c59001732---dafop.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/gomodiniwojo.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/rabemupite.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/87969231537.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/531b7fd3aab53ef24d6bf3a6d0c7067d/pisupomusitin.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/gesekob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=partitura+riders+on+the+storm+piano+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_off0000c779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 18172 bytes
SHA-256: 426343e22d8c196289162f6081d58e655f68e3da5d3f8a6ffc8e20de7dd223a6
font_02_sfnt_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 10816 bytes
SHA-256: 93b9a71c253b935b71faac6b12ab28b8428a04d20b218dbfb99f648409704c14

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