Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c119f1270e57978…

MALICIOUS

PDF

100.3 KB Created: 2021-07-09 12:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5916d19d4047f902c5cd499faafa3b95 SHA-1: a23ee50a7c184b2fd430fe8ba2e30a21857bb413 SHA-256: 0c119f1270e57978367d0a37411eea33f2044af8d46eb8dbb0d0700fd1da51e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/brju63ec3b3p9g7ah20gpr19a6/91056401972.pdf In PDF document text
    • http://aftckwt.com/uploads/file/97344780342.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/jizenudoxotojide.pdfIn PDF document text
    • http://health-bridge.in/upload/file/55455140040.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/74648830359.pdfIn PDF document text
    • http://mousike.it/img_ins/files/pewomumibowevo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609725ec73ce7---56351372163.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/61315250265.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/6bfb10ad53d0ef7e3cfe7b7ce920de09/73773843220.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/4sa91ta83hmo1asvpaqgno9mh6/gejezotuwo.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/weduxapelojijijemolipafu.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089921fea5b0---84577085352.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062605164686.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6ec941f76---29580242393.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/73070037880.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/347fen1npgi2m3h6rpvdfctnbj/towojasojejat.pdfIn PDF document text
    • http://aplus.to/userfiles/file/5191717747.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/ferabesukofaniba.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/lugefimuzesogusakomiz.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f29e374d8---bapol.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ed3c40ao8id6e7k0t23d9klhg4/lixotu.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/iflgq056oabcn0diqc1qncbq1j/84962528414.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/20176564119.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/6d14319436828a47cbc050eb0e65ec56/41724999603.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/klj4g4c85kjh1nkhgm0hcpmif2/moxenokujumemu.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/707dff3ef15a186e97181bdfa4013c67/53974568232.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/gexetipeledozexojoguwewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+song+i+bust+the+windows+out+your+carPDF 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_off000120c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C3 11004 bytes
SHA-256: 6e9b44019db49cd5f98aba771eb0815f9f82e43203da5cf455e58c5c6200f79b
font_01_sfnt_off00013a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A32 18704 bytes
SHA-256: abb2183d96026c9614be84329675ede4591688fac8a98ffee6e40c4cf23a868f
font_02_sfnt_off00016b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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