Malicious PDF — malware analysis report

Static analysis result for SHA-256 377cdc27bc38a3b2…

MALICIOUS

PDF

91.2 KB Created: 2021-09-07 18:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 900baae67f27e92bcb16ad929604641e SHA-1: 0b09da4198fa1c694644599d9f23ecd57c42b2a8 SHA-256: 377cdc27bc38a3b2061f25b240476b4ffa5e65da2991f256a8e32be0df785bca
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://gibkrakow.pl/uploads/files/botokerewudawamakulubex.pdf In PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/025bce5cbd6b6c9c08ca338c28ff186b/91946469507.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/paber.pdfIn PDF document text
    • https://5uempat.com/contents//files/41293923044.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160894244dec57---24436090311.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/27261179108.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kvkk3e7heaiora4hfkjsvimho4/70378217530.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/dejawi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f933434616b189356465f71289c3ec00/tupefapububumevegovupuxas.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/13415007679.pdfIn PDF document text
    • http://dgjst.com/upfile/file/26671687937.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021081804032371.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d242197c5---44437123724.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/tomotorosegul.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1a2dceed---63981969010.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/b7d47e3c94c332a8ad3716febfac92e8/19419221992.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/s1lnb31mqs4oea4fhekd89m4ri/jepogotodilurizefodip.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/40907146529.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/c92laj2sn8g0sj6s365ngl5uc2/88828990775.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/05e63db42736eba8556ee0d767a2e511/purekun.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59dcc508af---losiparajexalufaz.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ffc9c85c81aa197243456e70e1113903/kodirogogimoxuxo.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e6276e729---bobewodikenaxezujabekexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=simple+interest+examples+with+answers+pdfPDF 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_off0000fe83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 18248 bytes
SHA-256: 8149cdc4a467bf51567849129f348fcf5bde046701bf6ff1bf3b3e8e5ad42972
font_01_sfnt_off00012dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E6 10908 bytes
SHA-256: 7279614379e592f19c88595a0e787444b31df6fd6fd25ca2d18efac0304ea368

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