Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b770b3bb5bc2c25…

MALICIOUS

PDF

78.9 KB Created: 2021-09-29 13:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 19fb083e4a04602b4929a4d86da6e6d6 SHA-1: 96a49c444d0860fe4bd557995f6b7e8aea97dc8f SHA-256: 2b770b3bb5bc2c2501f7188c84fabc35e21f58872f905e8b1d30d1d0224d05f9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://synerhu.ru/uplcv?utm_term=samsung+galaxy+a71+vs+iphone+12 PDF link annotation
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/75683570320.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/68279468294.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/lifijedewetifonib.pdfIn PDF document text
    • http://juncheng.tw/upload/files/82258439086.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/6748649771.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/ridojutagabew.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2beebef9ff2e5e8965cdf83fe1c56251/mutupenazasijuduzami.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301a1687a3e---rarumikimo.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/72690731138.pdfIn PDF document text
    • https://binhvi.com/upload/files/28647188782.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/fivosurigijuv.pdfIn PDF document text
    • http://skupka54.ru/upload/m/rejokofenijo.pdfIn PDF document text
    • http://haki.vn/uploads/files/72213368692.pdfIn PDF document text
    • http://pvvc.cz/files/15372990488.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/soxagavufowowenowisawew.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/sabawizewaludapom.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/zuzojerawatusariliruxoti.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/xapomedot.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/6028466824.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134e613e8468---88871553365.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613833d3065d2---rokiz.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/tujew.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/buwexibivolulaxu.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/98005254615.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/wuverukidagilugerataf.pdfIn PDF document text
    • 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_off0000c522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 21220 bytes
SHA-256: 9d4a7d3d8328bae2f38cc6fa83715201015ade981c3fc59475d3de5f3ff2dae0
font_02_sfnt_off000113b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B5 11180 bytes
SHA-256: 6487b2a185b2c7b9bb095672813d2a525f68aa19c8aa30e14559fbddcdeb1730