Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff9cd5eb6e301d2…

MALICIOUS

PDF

91.1 KB Created: 2021-08-17 09:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8cc42f1d08288c46d50ab920ded4ad84 SHA-1: 93ac47d3e1a9b67dcb6cf6e8fb1a7f5ebc3a2981 SHA-256: fff9cd5eb6e301d2472a5311584f7a984728272d5009448f4602bb1f1d248abf
124 Risk Score

Malware Insights

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

The sample was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as a lure to deliver malicious payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2680

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 https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071b60f65ce6---33443386381.pdf In PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/93234635091.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983f9666a8d---nefovofetabafodo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160757c8e5e02d---75532446032.pdfIn PDF document text
    • http://halmar.info/userfiles/file/tuwuvar.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088839430615---15007782734.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/37241408082.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e019e0ffdbcf300a9625c11e19d97774/lajukulimapituvujirix.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/0ac076dd2ce794e98decc3934cfb07a7/8764459104.pdfIn PDF document text
    • http://bjjiffy.com/upload/30329722361.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112122a0c9f1---56439630918.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/66238575668.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3db1b5df7---37996072974.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/sovelonu.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0f9cb23b---95715282831.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cddc70ffc6---76279842532.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/21013576499.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/desawukavotudod.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/gifunakejevakug.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/sutuwinozeruzamafuzobuzu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099511b518d0---pasemapewomu.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/motusobazul.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/xodunubamenibiboduval.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lord+of+flies+book+reportPDF 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_off00012002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13814 16948 bytes
SHA-256: f057181df75442866e6e4b4a1751e9ff6ab93eefe4ea23cc590729bc2c84ee0a

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