Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ad1a08e7841017…

MALICIOUS

PDF

86.3 KB Created: 2021-09-19 03:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c1ee750f2c7b7cb8f420259da616aac5 SHA-1: 6804d988b7418e7cdde7461ef8b6e2bf63e57310 SHA-256: b6ad1a08e784101704626b32927c695fb0aceb111ee275f6b7fe20115008c0f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript further supports its use as a delivery mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://njbeihang.com/uploadfile/file///2021090407361765.pdf In PDF document text
    • http://alnoorcity.com/userfiles/file/nesagujogapoke.pdfIn PDF document text
    • https://masukpt1.com/contents/files/14769898965.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/44854221988.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/73609332977.pdfIn PDF document text
    • https://fond.ru/userfiles/file/vizedizokezotakarisedu.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/sobazonudepisezanonuvezez.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/lugejipipolorevoruxun.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/66sqti24vr3vlvj6ll0pq984ft/fozidegepodegenajiro.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/75696233071.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5316df089---87382632323.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/lajatupumotoxeligupoju.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613158b5a0e6c---66636599391.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/bikenotipifigetajotevedav.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210909061619_cf5190.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/26fc6eacb42070349c9ce2d90b1f25c2/ratusixomoziviwakobu.pdfIn PDF document text
    • http://orem.mn/uploads/files/menariwifubegisitoja.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/6134527176.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/95420464992.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/jovoposagomovixu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9aacb71d---namotikuz.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/jemujatojor.pdfIn PDF document text
    • http://potlista.com/file/files/temixamukizirizobaloge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=multiplayer+video+game+best+games+for+androidPDF 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_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 11252 bytes
SHA-256: a9eb33a42b0ca8ab3de8fc552fae39ff7171c9a2a0beb6bddae0d9c4b4ddad53
font_01_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 17440 bytes
SHA-256: a25ff41bfa0ce0cdee596c5d85e3fa188e280adc22137e6b5c02066a15a51a23
font_02_sfnt_off0001335d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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