Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3672b11517f981…

MALICIOUS

PDF

116.0 KB Created: 2021-08-16 16:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a3f980c7ea426213aa35b46f96a1ba5a SHA-1: c6dcf3e19537f9b7a32ceefe2f23cd8078293782 SHA-256: bc3672b11517f9810e5e755e4bee442bd6ca66d49b4c02d25bbaaba80b2ac985
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://pistant.ru/uplcv?utm_term=libros+de+como+dibujar+caricaturas+pdf PDF link annotation
    • http://wsm.hk/images/uploadfiles/file/vubivuguxabozibejigafulu.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/wilibozi.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a26b30c35a5---pelit.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c26320399ac---dawugirabefides.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pozokisovonefok.pdfIn PDF document text
    • https://avenue102.com/uploads/file/2606519535.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/tubipufiv.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cae364be3fe---togasamexiwovomivufaxom.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a82ac6e964---kesugoduruvewasiliv.pdfIn PDF document text
    • https://superchills.com/userfiles/file/11939955593.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/69833248804.pdfIn PDF document text
    • http://blueyee.com/upload/file/031029076429.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/10038ee1032f7af63fbff68427fe8bb5/79573837024.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/81173841324.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/8e142b24fffc2677fe9eed1efaf3f31e/botesavatupukela.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/dupijasizuveweruduf.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/wefibafoxomaw.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e27fb4f3ee03db08bd321b201d034f84/9137558965.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7b8e60bca5d6ac1014eb988cda98fb90/28765054138.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/thbk7cp7raslppen9rmcfc1ilb/rigijovumud.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d110b945---vavas.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/77080301029.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/vosafusutupasufo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ced0193ac---susuji.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/00ce91a697867ed1a8af88fb986f6527/zowewimabinamek.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ebddf54b81fd21a0ebd24908cd50a17b/75441783516.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_off00016254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16254 17440 bytes
SHA-256: a40e6bd27b59ed793371c6d73ace86174201d2472f43d0d05c21ef36e93f7656
font_01_sfnt_off00018e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A67F 10960 bytes
SHA-256: 44a8ba26fa7ae4c0bc83883bd04f77026eaf05500cf20b47aa56ec84084af0d3