Malicious PDF — malware analysis report

Static analysis result for SHA-256 6224180c37facd7f…

MALICIOUS

PDF

74.8 KB Created: 2021-06-10 18:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a9c3d75ea2c3ffbdb6244c5a22ebdfa1 SHA-1: b71bc4948987bfe79d25357c277075ed03a9de89 SHA-256: 6224180c37facd7f7eba92381d8652895456e758188f94c454421da2595bab4d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 5

  • 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 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://oniceh.ru/uplcv?utm_term=unicorn+cat+colouring+pages PDF link annotation
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f09a37db1---29932610113.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/994344601.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/6321888913.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6e10af94fa16feae2e5e688c525631e0/25524708794.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/3ce0ab5b6075b6c6fef313ef9e83567b/1504597683.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8ee15fb85---81309629010.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/e21ff43d4c0f4edf5f4f18dc3bb3db77/47323860815.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/401e9503ccac676d60c37ad179ed505a/bovogodewelunu.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/tunapunofofalota.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/gilalajopixewakibapimu.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210530054439.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072517a0ec3a---55141836409.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc909e8a05---63086918940.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/xitazi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b502ddd769---dopavozusabolunanuguxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 5092 bytes
SHA-256: 19f3933dd0a59a536c159ab796cfad8d48edd0a89eb1d3bea4d30ccf90969514
font_01_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 10268 bytes
SHA-256: 0b82c1337a152c876ad0d8283462f077201ae2828628c6d4a41fa7c42fb39276

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