Malicious PDF — malware analysis report

Static analysis result for SHA-256 30217b5d2aa44dd0…

MALICIOUS

PDF

70.3 KB Created: 2021-06-13 05:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2ed4f0e20e166c4542614c3d78e0c052 SHA-1: 37e41ba8d8380099addd0d132b63789c44667bfd SHA-256: 30217b5d2aa44dd0cb8faeda3e12ecd46810068f733b093831e0718a8654535a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by 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 0.9889

Heuristics 4

  • 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://nomylo.ru/uplcv?utm_term=butterfly+fly+away+mp3+download PDF link annotation
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/p0kff59v3711h2uu1k2iqh2kn2/rezobi.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/2fdecbd47585015225f546ac1c0d2805/motonifalosulowebuvemana.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/dee9f0e6094771795a9e24f4c564ba72/lopikexu.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a697d7ed155---39902189829.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/69035828680.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/xiliwiwililajajogaxid.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/jozuvujalitisivefad.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/416f470aa9d42479eddae9e9a95d264c/xowikawurotid.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c652ef488---dukolaw.pdfIn PDF document text
    • https://signika.pl/Upload/file/lifavomivigidamufoguzif.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/fozevonunivekekisive.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073020fd4eab---dinudijaderegu.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bc26043649b---94575124194.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/eejdfijp3tc8gosgvsbdjqe0p1/8624795792.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/25351485dc9d80179cef6fe43d5bdedd/32055696133.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000df18.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDF18 13644 bytes
SHA-256: 7f0e2bde102805dad9c0ff463023368ab6f5559da3566fc07e3fb97402d0518f
font_00_sfnt_off0000cd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD46 5252 bytes
SHA-256: 2d2ed7096a70dbf9135c6851f4c091ce7cde2d51b6b83680c8ba30ebb0121f8c

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