Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb379807a30d74f…

MALICIOUS

PDF

72.5 KB Created: 2021-09-13 17:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 04617aca5d370f26ab348fad9fff3367 SHA-1: 083f764af8eda7aa192c319ea9c5f83393f401f0 SHA-256: bcb379807a30d74fc0d6d3f63dfe36e975de336a0490d8a906a5a74e27676daa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links pointing to external PDF files hosted on various domains, suggesting a link farm designed to distribute malware or redirect users to malicious sites. The presence of compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7937

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://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8f241b188---pomojovakijuvek.pdf In PDF document text
    • http://escuelasfutbol8.com/docs/files/sedozaxapetij.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/34651873362.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/13197081886.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/55372558531.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/xeponaminirogasud.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/gativuta.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed5842cff3---paxegepa.pdfIn PDF document text
    • http://888chji.com/userfiles/files/48263492699.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/ludijidubudilipogoba.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/wimatogok.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/nowatokonewometif.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/jinazinonis.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/mezerumutizoz.pdfIn PDF document text
    • https://questyme.com/userfiles/file/68129478869.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/81547913704.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a830a83611---pesojigavogup.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/panozosepixekelasaze.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/xomamedojutitedixo.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3f198f03---66918263217.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/mutevizulaze.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/licu9l70hob06rdvdcrklovc03/8363882197.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/eb1048619df38f7e694bad191829c7ec/29996809010.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/59066611738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=abstract+algebra+dummit+and+foote+solutions+chapter+3PDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/bavoxafedewiwedaranora.pdfIn PDF document text
    • 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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 11460 bytes
SHA-256: 14fc46ba2c01e119018c6b9f4e32affb8d1830146a274892c7305e6713d523aa
font_01_sfnt_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 17984 bytes
SHA-256: dc2bc80da06f36b24ac84a2bec10f0ef0aefc084efcf838ab9cba6e63502af35