Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e2ed4686c9cbac…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 15:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 855671dd8af7ef613789400b5ee0417e SHA-1: 7ff04b9d507752cca11c032a2ed61da12d1b3f65 SHA-256: c3e2ed4686c9cbac5b9741c7ec437d015692d63ee17e82a00fda92fe02fb0c6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://minipowerpack.net/upload/files/99416945573.pdf In PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/bememetoguj.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/fizovusobapujepofanoso.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/83727332418.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/52952061513.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210901140954.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/90274489959.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/romup.pdfIn PDF document text
    • http://watch62.ru/files/files/vilixiguzozizug.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb14b3e34b---wuzuvemuvozoditopivakunav.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d3bbd9e4b3dc9c9b5542e80e1c7bfe7f/sipezi.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/govezedu.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/55805628758.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/87208360614.pdfIn PDF document text
    • http://amkchem.com/upload/files/boguxejujo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614103a262d3b---49689040751.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/91957823458.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/dudedirabulalokimunuge.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/73404426537.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/870e502461625f876acba18c493e5e68/8799547106.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/dezosuzisifazum.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/vodulesupagunasotedupub.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/40255036466.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/wozurelegunajotapumixika.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/kaxadunonukogufubuxore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+vpn+apk+2020PDF 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_off0000d08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 17100 bytes
SHA-256: 91a21f97ebd69caebb99cbae54ea58a17b95c6323a741178e2cd41a7aa9e0bed
font_02_sfnt_off000114c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C9 10340 bytes
SHA-256: 9506310d70595311cfa4cae58f2c4ae71306395a8d521841b50dc570e10971cd

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