Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b942bbbe10aa4b5…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 04:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ab317c7cbfd0c0775d56a5aacbcf8e8 SHA-1: df8bcc26dfa82cf60125290629f860fbeb4a534c SHA-256: 3b942bbbe10aa4b5b114333cfefd49ed461ce9facf820f8ae675c3bbc552cae6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://xn--9w3b270a7kf.kr/data/editor/file/wexufozij.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/oub3kr7chh9lsbp5o4kmmtphk4/35903217848.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/tiputowuxurikokejaja.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/36462460427.pdfIn PDF document text
    • https://ijpdua.com/contents/files/rikaga.pdfIn PDF document text
    • http://dalaichau.com/files/33660928958.pdfIn PDF document text
    • http://ranchobg.com/img/file/88881849575.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/98e0mf9gchq9gj596gcfna826j/sogipanakewegizazatex.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/fd2ccea8e58ce29ef3a91ba9d347ce5d/34406102558.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/59475100910.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc81b6bd51---48417281059.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cbac31b32---tejirekan.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/61417312612.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/11789642301.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/gerijujibefij.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/mixuvamuvakowi.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/fibope.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613376c25f4bd---jeken.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/judolapisibamunatevevubul.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/39082543559.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/58855966972.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130322145dc0---21509168686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=packed+bubble+chart+excelPDF 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_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 16920 bytes
SHA-256: c334ce2b168b89074fcf7c34e780bd8bbd63d8d48da8026ac5eec488405af7d4
font_01_sfnt_off00010872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 10416 bytes
SHA-256: 3499e57800c34163cea68361711243d4c69ea087894e0c3e5b347c239afc5284

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