Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75d75c867ca0ca6…

MALICIOUS

PDF

91.9 KB Created: 2021-09-01 18:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8edf286cde94524f518ccd7a20754eda SHA-1: 58e5d8de817d39007c5cde0922bdbaeec002b177 SHA-256: c75d75c867ca0ca6d042a99f6807ec868423988696f8c43a6eb2baf2508138f1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on various domains, indicating a link farm strategy. Several heuristics confirm this, including 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO poisoning to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://trinityautorepairs.com/uploads/files/94910801756.pdf In PDF document text
    • http://getsolarnj.com/userfiles/file/39000181116.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/au09pi726lco0581bnikabk0q1/ziguru.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/30846307166.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/tevaluk.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/98163983904.pdfIn PDF document text
    • https://jjpremiers.com/files/30435291275.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c0a269116---ridebuvurutofaxer.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/wefivorewisakuveb.pdfIn PDF document text
    • https://soechi.com/userfiles/file/59375730611.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/813b5a5f5b36bf42a7a0d4239bcdfcee/28499881136.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/xafimarapubixetakusiwizef.pdfIn PDF document text
    • http://ceroki.com/image/files/656213168.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b841e7523c6---xejumisumunijesididexu.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/21942922593.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/278dae738cca5c8c977ef7ea9d1342ef/14294592683.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/96129921348.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046981b6ac---gofazomeja.pdfIn PDF document text
    • http://goldia.cz/data/file/40587001334.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/navuributefobimix.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/15980917852.pdfIn PDF document text
    • http://jimigubellifoundation.org/clients/f/f9/f96c94eea877db95ad0a8b6fd709b1ed/File/korokepoxamuzuge.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/pajanigebizativomolavi.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061004043364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rs+aggarwal+class+7+maths+book+pdf+without+solutionPDF 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_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 17580 bytes
SHA-256: 071a7eca8fd17c1fe9ef27eaf428b98f51e86c0e0472527aec15249bd2f8b35d
font_01_sfnt_off00012d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14536 11448 bytes
SHA-256: a6fcf4424080ce43e818504d7c550e261c90566263f6b232c4c431c73ec82c67

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