Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd61a927874e5a8e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 05:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ceff3db3525493685e2cbf3a7b95e61 SHA-1: f7353bf6af1b8255dd6ab06e1d3f9796575dd146 SHA-256: dd61a927874e5a8e03380822aac3a12cf9efa2a328dcd3cdbe948e9fb4d0f8d0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ip-kamera-rendszer.hu/ckfinder/userfiles/files/bigopetibanupadilidebop.pdf In PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/tituxa.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912230622639452.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/sakenaboru.pdfIn PDF document text
    • http://signauction.net/userfiles/file/3830653260.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/2248520450.pdfIn PDF document text
    • http://millecolori.it/images/file/79544172912.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/70673045542.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219112222199746.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/bodikunijijozuxekedubawu.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/vifimenirozigulej.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/81515249999.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/67044864115.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/6326q517ef3s0l1pde7tvtr7f5/bukipivasumasak.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/kemajowagefefog.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/16314756230.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614341e48405a---sojekodobunafifixabegokur.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210917165611_1963555538.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/refikeponuge.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/zafojipesezatojabe.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/013f1b31f425161202478510caf2eab7/lumofumemelex.pdfIn PDF document text
    • http://markone-tools.com/upload/files/fixipokipasan.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/67980172703.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8f692e86---gerufexijoduluze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cinderella+disney+watch+onlinePDF 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_off0000e149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 18128 bytes
SHA-256: 193ac8083d85e6d4ba56bd82b263a86a623f2bee4a86bf895eb28abb8c9f3330
font_02_sfnt_off000128a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A7 10696 bytes
SHA-256: c9e423845d251e445370d3c936e4e57a81d778e8470e897036a32645e887b111

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