Malicious PDF — malware analysis report

Static analysis result for SHA-256 57028237ac0e74a9…

MALICIOUS

PDF

71.5 KB Created: 2021-07-08 11:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ea99aa3da2b63a8ded04dffe0f5c9622 SHA-1: 1f712d432ef106d8e8e2e7f2863dff6821b6ef09 SHA-256: 57028237ac0e74a9aac8ba5479fe000bf79a1b5f5db3905c156fc1f013260b4c
124 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier clean score 0.0095

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=uncorrelated+random+variables PDF link annotation
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/fulejubewelasobuneja.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a864166d1ca---vefuvixejasamunedigona.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096214732010---nafukekenitodomurepe.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/kazamejibogejozivowimo.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/1131dc47811e65c2268bc5ba30cbe058/94866448110.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/9859253733.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff21f16104---67815382089.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/12233325802.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5354322a---tugexofoji.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608cefc08446a---josakusozuwikiki.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bf28d3a7fd664dfb74530f3c0e56bcd6/pekadimafitubulit.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/893a1c8a1bd67a1b21743c9b93e1d833/fawelibidota.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/984bb5642ff4c19d581415ed29a4b0d3/4232860659.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/sirimetixaverudupudifogal.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3b749e31---zomibutujesorosaxogoki.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082236f831d4---fexetabefumitinexoxij.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/44326271977.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8617ba309---49424450016.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63423197553.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/32625900249.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/85023578985.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210705_465202D3415FFB4A.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/tepewubajumibux.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/568199e181643b11f077513c34a93a56/xuferomemafu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wekopemovulikupezanatuj.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae356b54047f43df363552bacbb33fa3/96482574443.pdfIn 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_off0000bea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA7 10744 bytes
SHA-256: 63b7f31bd461b3b3bc78c04a427ee769ac7583392912627105bed8417ae1fe55
font_01_sfnt_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 16144 bytes
SHA-256: ef6e25130bf1d6376675819d80ee65077b7d812d11d011620a2f18adf6f7686a