Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d703a68066407e6…

MALICIOUS

PDF

72.5 KB Created: 2021-09-07 17:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25e25b60c57b5f00994c1a7b5f1ae3ac SHA-1: b95e43a9d34d35f221f92d963d4ca41134aebe6f SHA-256: 3d703a68066407e676c60952588c728ed9356049d1716addf8263f94d0a6cf91
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure on disposable hosting, suggesting an attempt to lure users to external sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4086a59d1---23037558610.pdf In PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/43462554877.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/85e76cd1b031c82e48817a6486ade61f/3150078957.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/kixifuniboxipen.pdfIn PDF document text
    • https://hgb.se/filer/file/12494807715.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35f2e6c05---66134879232.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/98369546505.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/e8e259c58e9245d2ed635b1c3c8adeac/xegojabiwibofomopuwe.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/wukotoribuwufagipemokem.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/86780740457.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/94463140011.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/9738517536.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f1f893c8---81729704211.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/50469673149.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/lasalavarapolifu.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/zasiwitotev.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/kavumabuwixakax.pdfIn PDF document text
    • https://unosms.us/userfiles/file/41169253119.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/4585394285.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/95837552393.pdfIn PDF document text
    • http://texmet.pl/userimages/file/79777942.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/8598808049.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/redowuvev.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/foxijojadok.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/gononuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=manual+del+conductor+costa+rica+2019+pdfPDF 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_off0000b7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E8 16400 bytes
SHA-256: 0f21071d32d9d9453153deff6b7203f7ebf4d4f11953fd661a35cbde5f38ef58
font_01_sfnt_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 11168 bytes
SHA-256: 99882b8024ddbb0d3324fe86bd2df073af7ea122ee80a984e031b3c55394cd98