Malicious PDF — malware analysis report

Static analysis result for SHA-256 755e0237574691b4…

MALICIOUS

PDF

88.4 KB Created: 2021-09-06 11:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 419e9f543c25de18ea880876c2993470 SHA-1: 5af4db41ad619447dca510fea4a47f33725a01ca SHA-256: 755e0237574691b4ad251dfb467b4494aefcc44d5f16152362b08f3e08503d77
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=rockshox+pike+2014+service+manual PDF link annotation
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5db6eb1c9---47635454483.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/duledelogus.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4afe6a5b6---tizapa.pdfIn PDF document text
    • http://stroi-sistema.ru/img/39149474992.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161089d01b493b---30383116719.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/dededinadapezo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/dfa63f874e8139879187e9ca9b115e95/mizoguzuxasepoli.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096f3e3521e9---zazakexogelumuje.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/19683282855.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/xugoritexarugavugogi.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/pugavuxubi.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/talaxososufovoterobep.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/kisejebi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7cb5ae55c2d49b62669be0688f62aa80/15542436010.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0c210425---23534210096.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078671110b3f---48409270317.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210715_E8073396827DCC0D.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/625f4198bcb325b0582dde4b70f42c31/89666143253.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b677c3b9---27425435592.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc37e2763b7---vipunifumikuguxiwofidovit.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/21080103510361358257npbi2bbdbt.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/lubadurafom.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/8593613677.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfbd68cad---37729939126.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/bujobenetibegorizir.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_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10773 19012 bytes
SHA-256: a2eef64f78731e33babb26ebdeb6a49404341455bc170b2df6b85c724266b90d
font_02_sfnt_off0001391f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391F 11316 bytes
SHA-256: 6a78d22cfc4afdd1a5eda9e10cd86ddf5d6af3c844453be258b4db02c8bf8c50