Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c8f9c8e54b893a…

MALICIOUS

PDF

70.3 KB Created: 2021-10-11 05:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bc93fa9fe17a61e68d3a46fb68a1f6ea SHA-1: 66bb6d2f197f3a4335cda853511c7764272ffa6c SHA-256: 59c8f9c8e54b893a2771c19833015fd736d7635159f969d24828248f3767630d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://huntic.ru/uplcv?utm_term=quiz+to+find+your+love+language PDF link annotation
    • http://naoshima-tours.com/images/blog/file/67982794498.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/jozarevevibibi.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/nujuvox.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1632122098.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/49748193448.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/95447480311.pdfIn PDF document text
    • https://affze.com/userfiles/file/61462662305.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/xixoxenasodakokop.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zinalojukitewonezud.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20211002212623_1540905675.pdfIn PDF document text
    • http://dmkert.hu/files/file/lovozixuge.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d05a3f3cb7700d8bbdc0e403ea7f107e/97788047818.pdfIn PDF document text
    • http://bdsductri.com/upload/files/46076729084.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/38769206021.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/zonafumupuga.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/tenufi.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/17310423520.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/kiwev.pdfIn PDF document text
    • http://telektrans.hu/editor_up/bobidizugowimenojitopu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16162718db0909---81941092942.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/lebid.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/94953974952.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/5vnio8qa1ap50vec3f1st8btmf/2562848568.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/28915424838.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615f52239979c---8720233215.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/27691874149.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_off0000b535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB535 14700 bytes
SHA-256: 9bec67654dd808169eca633a3dadcf4e94ab365913c8138f8e75f3aa4bef45d9
font_01_sfnt_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 10760 bytes
SHA-256: 872f9de5afb3142195b073939175555dce8ffe4a46f99d41eb2e4cee09e7ad44
font_02_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1