Malicious PDF — malware analysis report

Static analysis result for SHA-256 b378bf053415db5b…

MALICIOUS

PDF

89.3 KB Created: 2021-09-22 19:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad86aa6d34510053f967e520bba2066b SHA-1: 8fd570d43be371fe3f221f9cd8a91886d4e2ad43 SHA-256: b378bf053415db5b2a64ab5b90bb3cdc1674b5533d4ae562fa587f2ef1aa785c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised WordPress sites for hosting content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.vandiestbrandstoffen.be/uploads/files/79602590628.pdf In PDF document text
    • http://www.vinoplaza.nl/img/upload/files/62004865005.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/mozodivoposixunuda.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/bujupatibagan.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/69186952372.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/wefemumazeje.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/gunino.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/nuredabikifupova.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b207bb8b0a---zefojudozapiperikid.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/ridow.pdfIn PDF document text
    • https://hgb.se/filer/file/97792108737.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/23524984124.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/latowizozogusasudulu.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/lalajodijevumufeno.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/jitokerufobe.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/nexevenepesakerokov.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4e6e0453c---norugekojirebib.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e7ba94bf9---24331512218.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/5218862169.pdfIn PDF document text
    • https://fultoys.com/userfiles/wojepajid.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/xinozabixinuk.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109121554161431.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/6868501928.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/gololen.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/95449144422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=samsung+galaxy+s5+charger+not+workingPDF 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_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 11380 bytes
SHA-256: 9f222beb627173243ffc19b455767811b6878337680108e004a346b58600ab62
font_02_sfnt_off0001287b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287B 18108 bytes
SHA-256: 25878f752ddfe473b4bf97c863365fcf30d0f7109d2c2bcad97626946f908b50

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