Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3f8a9ed9f16e63…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 11:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4eb9314c143cdf4d26f5061bf0e006ad SHA-1: 9c950174d94ef047fdda7e7aea455650c4819f8b SHA-256: 5d3f8a9ed9f16e63c22f5b3aa2c0acd62cc2725d86612880c8e96dabff414b70
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on potentially compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8586

Heuristics 5

  • 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
  • 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 http://mazraeir.com/images/upload/files/gakarajewizatoje.pdf In PDF document text
    • http://studioassociatoemc.com/userfiles/files/22876837144.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/dunupebewo.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/68102205373.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/88862378572.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/18298878445.pdfIn PDF document text
    • https://medtek.vn/storage/file/22651850138.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/70059369397.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/levubozufasujes.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073365457b3d---fipufexukumenibizulexukug.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a51e064418d---54397277578.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/74694481000.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8a2285568---88693038142.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160e09f9abc5e4---lunofapixomabogodizemutan.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/24892597385.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725c64cf4a7---merurakape.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808a4da7555---sikov.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/j9n287acsgcn2p2ggh069hriqt/81516861539.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/40de9a3a383c16c3fa013f12fefa307c/28980932398.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/96184360902.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/85134556081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=water+for+healthPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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