Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac16b0920d76a1d…

MALICIOUS

PDF

84.6 KB Created: 2021-08-25 12:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f384f5b1989c2c61caa62f4a8f4f25b5 SHA-1: 566e1df7220c5d2928c2e8139fe47dba5d2c6b7d SHA-256: bac16b0920d76a1df4e3c159b5b3afc9fd78148e47d0ab6448837ba79f552397
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5610

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://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48c2d01e13---woxomam.pdf In PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a6c10478e---91923620552.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ebb650eb3ce41be82c09af9e8f957067/jafedanokezapen.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b886fccf5a846fcc3b618b3a20fec947/11941705116.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607276ba75a6d---diwubiberizijoluwe.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/kavudukaresi.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e40b21abc98a493ac3b32524136694b6/14053012748.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/79407889799.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/tce4eoi7h278lplr1j8ra5iujt/nisusavusi.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf38c1ea6d---87870231511.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a3b90c76090f6c508b97a5caf15c8a28/zaruxokigukidewubero.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/fe35fd5ad41268ccfb5c74ebba5143f6/rivesozinuwusomipaviwuk.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c909d8851f9---94049742509.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/fec684051e3ca49e8f45d238684e8147/mipexuwigunuzidozami.pdfIn PDF document text
    • https://agermag.ro/mm/file/suraviwun.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210515081428.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/54352135091.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/cba444a580ac98f1aae40f0ee3f9c18f/44445093428.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/72364711586.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ht9cu8qti6f2barlhmrjlg8695/nalokolofiturikorosujir.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/53465423315.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/96742874246.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/69852216914.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/795485ecb0c3ffbe935decba88d74982/42942432454.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d80253bc323---zafovuveremuza.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/9a61ac703d116fac5a43f69d97466341/9909739736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=as+i+mentioned+before+grammarPDF 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_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 16936 bytes
SHA-256: 088ab619730b2b7cbcdf14c1890a3ef396842cecf6b6bbe870631100a4061230
font_01_sfnt_off00012fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE8 10772 bytes
SHA-256: accaed3396e84a56a9b6d91d1d80fc7d340327f67ae790d963916c15fafaec7d