Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fcc7a4e3b476e8…

MALICIOUS

PDF

70.5 KB Created: 2021-09-10 03:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 642399d31c3d113cbb2866858e0af7ec SHA-1: 24dba7b91118225fd1a5cfcfbb6f895f2b72f6c0 SHA-256: 19fcc7a4e3b476e8926a13033a4f43cef9a1238a1c6d7ddce9e481e962e89a51
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm that points to multiple compromised WordPress upload directories and other disposable hosting sites. These links are likely intended to redirect the user to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://twfindia.in/userfiles/files/55392357768.pdf In PDF document text
    • http://valdhans.cz/userfiles/file/18749596756.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/21194402557.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/takabepokalebeletofimova.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8000152d0---47254947663.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fbfa2bb56---guziromufezunoxujapo.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/96419278072.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/79324711509.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132faeef15c5---lidutufevapejiroj.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/58043163593.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/kozefowikiradixewafuze.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/87145051705.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/71901265094.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/pokakigivamunetepedofe.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/sogavedazusox.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/ripuwagen.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/32473439739.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fab12467e---63000456883.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/kimiserofesotoruvanu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a778e1f1ca---12379065050.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/75741691451.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090517004373499.pdfIn PDF document text
    • http://effektfilm.de/files/file/64863465737.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/tubewavabelikalelupefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+king+of+fighter+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_off0000b5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDE 10472 bytes
SHA-256: 9c660be4a211d2897c89559a04c24fda9fa0813f930187e7612cc20864ebcbc4
font_02_sfnt_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 15412 bytes
SHA-256: 3ebd7ebaea2b22c7e823d739ea1842e415d423d7d515558c903f99f7ba8183f9

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