Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f43d2d45da0102…

MALICIOUS

PDF

92.3 KB Created: 2021-08-11 19:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2dfcff6c02c9b64ef5aae10ef17b412f SHA-1: 573f8ecb25824db6ab6b4edcf2f254676f79e3e1 SHA-256: a3f43d2d45da0102af1be89077580a7094aa125932d228a4146cb7c557e0ed0c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to websites that appear to be part of a link farm. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable hosting, suggesting a malicious intent to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://whiteplacard.com/UserFiles/file/46301950784.pdf In PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073dc0e439bc---10380409857.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/14966038946.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/baf79d0ea573012894aa7c3574ef7db5/50108226640.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/xumaxofefapidevemirirobus.pdfIn PDF document text
    • https://hongmao.tw/uploads//files/202108101243528772.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/28336718101.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/19tnvsv29p7pk0av3ft2o210lf/satonebutixes.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/45292841673.pdfIn PDF document text
    • http://traviet36.com/upload/files/puwifuxusoneb.pdfIn PDF document text
    • http://miguktour.com/FileData/ckfinder/files/20210710_DF12818E9B586AB1.pdfIn PDF document text
    • https://birudongker.com/contents//files/99474714163.pdfIn PDF document text
    • http://holzbau-napetschnig.at/zunavug.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/volurivujejiwalosiges.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b6820f04a---somepepilazemote.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/wutum.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/48444710654.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/n34gv93e4ij38cra6988vfv3m3/71137967648.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/tewitonagujunes.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/suxivow.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c2cff8306d---porif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+find+out+if+your+hot+wheels+are+worth+moneyPDF 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_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6E 10908 bytes
SHA-256: b8aa4ec65b4c97ec8750083e7fee9aa474ecc5996e112a17b3ef52a19f8a0a7f
font_02_sfnt_off0001357c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357C 17192 bytes
SHA-256: 911e1b5799c2027de639088ef2b68b0e774e2d50855907a9d319cf762b69ea6b