Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e73791184a843b…

MALICIOUS

PDF

95.9 KB Created: 2021-09-18 22:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4237111a6a3032dd672078eebcbcfd2b SHA-1: 2ce56a991b86098c9112ecc470e60cf1c493563e SHA-256: d0e73791184a843ba67a9df74220f591accb3669054299cc8de3ca4585b88341
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 ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coyada.com/up_images/up_images/86405844980.pdf In PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/60914124511.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/16732835426.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/23cec57def1ecbece49bb204185306b1/27019981353.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-14/20210914141708831375.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/50095304510.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5766e53a1---39377780844.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/zezuzulegubadizufuzuxegan.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/97221102749.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/raroxajomelonefolaz.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/fujiparila.pdfIn PDF document text
    • http://195exim.com/datas/files/daruxunitijetunizuzasu.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/32406901490.pdfIn PDF document text
    • http://salkim.com/userfiles/file/1266422441.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/14063779313.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/gudobebizamu.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/xalepinevidakuke.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/selozurosuxejenasopolet.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/xugumovogo.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/bd5113e1b988027638cbe174d3e8a578/karezuresuwaf.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7c5f50ef7---53727351937.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/31602368706.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/rupipulunajive.pdfIn PDF document text
    • http://3sdent.com/upload/files/80601115892.pdfIn PDF document text
    • http://rld-carbon.com/file/67508357529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=connect+via+adbPDF 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_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 18232 bytes
SHA-256: f22ec94ad2ed34075e16c865e119ab85bf042743c53218a5fa991b6c0ae5fe54
font_01_sfnt_off000142d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D5 10284 bytes
SHA-256: 859ea00630d29c16d700bbf343437ae71f05dfbaa06a694c363f175be4ba3d8d
font_02_sfnt_off00015a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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