Malicious PDF — malware analysis report

Static analysis result for SHA-256 3126e36e2e2394c7…

MALICIOUS

PDF

83.7 KB Created: 2021-09-08 14:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec7fb0b11e6974461792c96c9d7835d9 SHA-1: e6adafa62bc8beb45ea4d626c5c92152cdb9ec2c SHA-256: 3126e36e2e2394c74a1ec8aa42c46bff6e1a01b4cfba6436621d0570b93cf247
156 Risk Score

Malware Insights

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

The PDF contains a link farm, a common technique for phishing and malware distribution, directing users to multiple disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or delivering a secondary payload. No scripts were extracted, but the presence of numerous unknown URLs suggests a redirection chain designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://tobn56.com/UpFiles/file/20578123029.pdf In PDF document text
    • http://chieucoingason.vn/files/22036176499.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/45162084639.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/84580554627.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/jivix.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/giwonifupig.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/miteginonujogimuxirodim.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0efeaabe6d5af97265ab83a02bf331ec/lulofuruledajojoz.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e8a9585bc4bafb88729298870ea0de70/38772334418.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134632cabaed---16510572443.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/pqs9a7gjms3gtgjb79hs9r3sqm/kufadu.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/zudurowebufokifelinonuj.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361068824bb---duvamameziv.pdfIn PDF document text
    • http://atek-ent.com/upload/file/19361198362.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161336310ef980---vavusovapofavikijizediki.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/83549077691.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/mokuzok.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/30956772644.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/detisogemekiv.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/kerojikogudotet.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/569gg1tlbppua108d1ner4pu90/gojuwaboduzoboze.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210904215931.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/37680644352.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/1482273918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+invisible+gorilla+christopher+chabris+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_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 19044 bytes
SHA-256: 7e208ed443153cdb831ce587e75382db9a227cef1896a156349d5bbd689ece47
font_01_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 11068 bytes
SHA-256: bd81a31dee292cc15628c698d2007accde00d9cd8e5893eb5d2f2df80da7208c
font_02_sfnt_off000128c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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