Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64ba408b708de95…

MALICIOUS

PDF

53.3 KB Created: 2021-05-24 19:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22455d5834111106c7f00ad1e01540a2 SHA-1: 2dc485e03aa188a351824067899cb8660d214f8b SHA-256: e64ba408b708de9540da50a88fd316199937586b36889fa77a27645172f2b937
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to PDF creation and potentially search engine optimization terms, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8959

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.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2f9e4f01cf5e6abc3d8edc4be8d0dc0d/44376738767.pdf
    • https://amitadevnani.com/userfiles/file/27404353456.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/8f96b1d7d7f6b69a434c3de322999934/mirajipabex.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/a47obh2u9oqnrm35d6ktobvmee/63365515923.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607867992abde---gumunimemevizaviw.pdf
    • http://allamericannursing.com/userfiles/file/bumini.pdf
    • https://advance-pack.com/editor_upload/file/67711657835.pdf
    • https://alshaabcoop.com/userfiles/file/63764880617.pdf
    • http://animalscipublisher.com/files/upfiles/file/19973463403.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/qkn4q586ljao59ovdg3qc8540e/duwix.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pi73iqnu4h91kvktiga1cnt8j5/tejevi.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08320178a---27137730570.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/6a9f25f1043fcf32948dba999f6aaddc/rorev.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67f42036de---65355320322.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d90b9631bc---rixaligejogozubimibilog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=manufactura+ingenieria+y+tecnologia+descargar+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1f0.bin
3a983e0fd435d4b4b878d14d2887fcc18cf77d9280ab01b56e86978072f7e3cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F0 5312 bytes

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