Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0e7ad8e1bd6d64…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 06:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b44d502db657b7462c75dcf286529596 SHA-1: 634a8a9c6624949826a3a3adbdeff35d350a7a53 SHA-256: 0f0e7ad8e1bd6d64c3673ff577be113ec5afde0bffd8fcf62a3b5cced881d7f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smwiarus.pl/ckfinder/userfiles/files/sokekatalumosowu.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c0b6a697a35938f0cc26ed76ccd7012c/46838292295.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a90668721ebe80965162d90e71f0d66d/47556645093.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/dakoxojoparal.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/18478444866.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/savalil.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021981756338040.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/vibugemulukonimad.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/54189618386.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/69313604264.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/zowujigib.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/63745685091.pdfIn PDF document text
    • https://haidangpc.com/contents/files/79287744594.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/1466972940.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/bipalanafulibenanufojulo.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/sutoser.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/xetado.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/govunuvenodorifenow.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/46197895827.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/etbm5li53co0982qoqp323jhn1/7923006338.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/23491534704.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/xojaletutibiwebebe.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/9777462889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+restart+phone+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_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 10520 bytes
SHA-256: 26808176710a07844d517119359035a6bff376c779f385bd74c4c09135cf22a9
font_01_sfnt_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 18004 bytes
SHA-256: 80a8aab3b08b5dc58dff64ce9fca8d00ed426d98cbb98cf69dcabd432245bada
font_02_sfnt_off00013181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1