Malicious PDF — malware analysis report

Static analysis result for SHA-256 767aff104cac4c0a…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 08:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c25bdee8fee410ceab9a1c128db0ee36 SHA-1: 72465efd855195a416c3ebab40fffc0be14c344d SHA-256: 767aff104cac4c0a183867d271db2e75a1c7d247fc274b963fbbf475ffa562ae
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 websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=june%27s+journey+free+diamonds PDF link annotation
    • http://borisovhlebprom.by/var/upload/file/gofuvekelidim.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/9877215664.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/zasav.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/gelugezutidijomidabesav.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109040252513417.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/nazuvegifizogatapuba.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/61357032914.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f4e456a18---vigonanit.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/51532943550.pdfIn PDF document text
    • https://siroyensao.com/upload/files/bemojulap.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/wixelolepaxil.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/dc0de74adc1abc7a05c0402b7d854607/nokogonira.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/95390957161.pdfIn PDF document text
    • http://gioithieu.btccorp.vn/uploads/files/90778429764.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/iu508ka20utu0tu27ahmm4vejb/70024527343.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/86266690497.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/72282587245.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/34627056819.pdfIn PDF document text
    • http://dongphat.net/upload/files/vatomigefavisuj.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/rumuwerusuwibevojafogi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363b7daf9c6---93656744457.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qemett7bjpb1ciklakv7m5ids4/xebubodiwexu.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/1991836397.pdfIn PDF document text
    • http://apcmagon.com/userfiles/65228755147.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/76832354462.pdfIn PDF document text
    • 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_off0000c429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 10740 bytes
SHA-256: 3557d42ed2e516470d2b8da078a9d301c45ab1b661f1feee0fbe9356be63796a
font_02_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 16956 bytes
SHA-256: 14ebe57abc809f417b638b8e99db0bab0a8ae36c083be02c3e0ecb6877b58f52

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