Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d860511fdb21ee…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 10:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3e51b41dd178bc111844d0ae0898314 SHA-1: d071cd86d00d068f5c5da921471e988fa21f39c3 SHA-256: 59d860511fdb21ee39a2cfeb5dfc96a69fb70832fa6a38c5fc9432fb242c98eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=watch+a+quite+place+2+free+online PDF link annotation
    • http://lltsg.com/uploadfile/file///2021090608162122.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/xujujixijojegegujujikew.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/9553818458.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/35137331886.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/69533821901.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/46448812548.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/95ea80d6d531b513623fc23acc69cc13/92758935341.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1712459a09da62d54fb3d96de930238a/mobojutegobemoxenige.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/juvevij.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/89044537167.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/61567649317.pdfIn PDF document text
    • https://go2germany.ru/files/file/lutipepi.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/11843914217.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/tlgg16ar8df9p21m3ll1aej9fh/15085972757.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/91476764657.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161481573dbe9e---nupakaketed.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443aeacfc10---20218539378.pdfIn PDF document text
    • http://oris-am.com/editor_up/sigamafonedazu.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/mixovusunowopaxuzami.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/29645947544.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/70463596072.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/rutixarajukilavosufaj.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pd09vieg2kugm3efh9i1o0fo41/72009185651.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/karijapomazore.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/gimebomozulifuvewewoli.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_off0000e92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 10768 bytes
SHA-256: 5b94f7d0482e84e354557aebf727ee5e13723e285ce911f956102c188cc6ee0c
font_01_sfnt_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0C 18248 bytes
SHA-256: 30c08bcf8bfed7e0d92ea1cfe22a9085cb076134b6d4f3d237ad23403110a310

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