Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ae99b84296f447…

MALICIOUS

PDF

100.0 KB Created: 2021-09-05 17:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 920e262e6212530835b2187830fb7a6c SHA-1: b9188af4a4cdb92b9b505ca8d5c416097b9023d4 SHA-256: 67ae99b84296f4476ee45c09ca01eee5e9d2b76a1c7c85809bed7e37f4366b50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.anieliasfx.com/uploads/textareas/file/vuduwam.pdf In PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/71350347272.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9381957f2228a843013b12182599adbb/zuvififipisasul.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/7b99cdac81c02ed3219ef9f9fab26a5f/71976188862.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/51402107030.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104c28406730---rilefefobipamik.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/rixomotez.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/9220119412.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/15742134501.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608e05e195f84---99922850722.pdfIn PDF document text
    • http://elpijisystem.com/file/jepekezepep.pdfIn PDF document text
    • https://tsolisp.com/files/file/bodabijevi.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/demozigoxogufijided.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/nobabotezinitatukamepijad.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/78772321624.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c250397c80f---gosuronajelu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1611cd3fa4307c---30827263832.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f7df49687---95908146308.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/kuraxuj.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/vejazaxoxerolug.pdfIn PDF document text
    • http://ibb-online.ru/f/file/43455724396.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/47840459050.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/feipjgbuglg2of4nil83du1jks/54442828956.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/49058337522.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/xipefobodibukitaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=nfl+picks+week+15+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B43 18196 bytes
SHA-256: b35b5d4e7d93a18d654d370368f5073c5acfb83c6f532146d52d880d6161ddd7
font_02_sfnt_off00016ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB2 10368 bytes
SHA-256: a57f884d66c1a2a67a25172d4ac9f4f2f1558e7703424339f321431397f696ff

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