Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d650282b2aa884…

MALICIOUS

PDF

79.6 KB Created: 2021-09-02 04:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 36d06fae7134862e2faad1929dab8f15 SHA-1: 467fda7500a186d1ef490394e43486610ea0e43b SHA-256: 57d650282b2aa884cd5205c71a01b8d96a8ea1da4eae10d02639be73c47faca9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites. The heuristic firings indicate a link farm designed to redirect users to malicious content, likely for downloading further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6314

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://costruzionibulagna.it/userfiles/files/parudemojavewegoliwuz.pdf In PDF document text
    • http://findplusltd.com/file/25131008508.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75eeb03005---7406738010.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/07/files/210715153300.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/520af51a5abc2ff14471fc03d2bfefb2/35087963285.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080ef134dfee---12622611526.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/sotopa.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/7e8e3e4916dfc56cd121583bdf27eacd/tawibefoj.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/pepajonusedex.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/78e885719b9d6153157ed052575ce0d3/31843836025.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/39848653546.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a1c92d78c---65438501365.pdfIn PDF document text
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/lezulonaj.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87009180e---10828736217.pdfIn PDF document text
    • https://digiconelectronics.com/media/zozudular.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/79710786266.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/0pkq8jmjcptdtq5b0fn584ehd0/30581102726.pdfIn PDF document text
    • http://gerocuki.hu/user/file/62384022731.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6b86429a---xipikiwukom.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1610433095f2f0---kewenapurewebuvowi.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/39957573974.pdfIn PDF document text
    • http://henca.com/files/details/file/nafidugo.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/60768168505.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd8d552d9c---wewefamasiwupep.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160717e47f3307---64126376139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pdp+afterglow+headset+manualPDF 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_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D3 11040 bytes
SHA-256: a03d9ac2c38a8213869dac121aa58ca2533e21c86251e134bc51f659a18fdabc