Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19a710d71556517…

MALICIOUS

PDF

73.7 KB Created: 2021-06-25 22:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c77cfb89fde85a47f3693967a6be8182 SHA-1: faf6f8f23d633017139fc0d69e8c82ed995dead7 SHA-256: e19a710d7155651786fcdc33d06b24d1135960da6b14b81f6f97049fd0752815
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it's designed to lead users to malicious content. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7611

Heuristics 4

  • 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
  • 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://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607750b9518cb---48959375567.pdf In PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/44026965643.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/tazafomegawovikoga.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/88459474632.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/385b2b724078ae2d51508dfc9efdb74c/setirotenorukutobot.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16079cfd3a6554---58292611447.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/dogimiweza.pdfIn PDF document text
    • https://andrejc.si/files/file/34392741419.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/97408582932.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca70ba0ef---lubuwebusipikoze.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/hcoib5o03t024l76k4r49hccj8/48993517556.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aafae75a66f---jatelerumeku.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/setagapubo.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607952435f626---75957300494.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/gokefazowifiwutumevi.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/33764403708.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/74323327699.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9824ab377---38391188496.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072520bd9cf1---97783666070.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/08cfac5fuk23r08bmqvlapnjl1/83234177295.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/39458018451.pdfIn PDF document text
    • https://aedwea.com/upload/foto/24491736345.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/44d50dce0d73531aac328c573480191f/8137727321.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/2566dba66c86e8e1c458744052549741/pumoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=income+tax+act+2017+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 16464 bytes
SHA-256: 7b37677435416d260672c4a50760a912f1372f8493911ccd7f7bf014ae90fb22

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