Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cae305f3281595…

MALICIOUS

PDF

77.4 KB Created: 2021-09-16 18:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6306f2e95e18aa2b2e83d7d11ea113d2 SHA-1: b6cca181202e418465dfc7f0cdd540cf85774598 SHA-256: 38cae305f32815950aa1dcbc31bb5a73cdbacc4c0a4fc4160cbdffac5ba72078
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Static analysis revealed numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body was unreadable, but the heuristics strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://recrute.fr/files/files/49136963790.pdf In PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/86076968813.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bc917b7d---fagupuguxabowu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161400edd66b08---butavumajibutad.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/tosok.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210909225848.pdfIn PDF document text
    • http://timocomputer.cz/files/file/bizoduxizatavidoxam.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210905_000153.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3ed212ad1a952e37d5ff952cf80c75fd/bizuxolodefazugiwe.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/71378583183.pdfIn PDF document text
    • https://angem.fr/userfiles/file/rugisagitukex.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/92969891874.pdfIn PDF document text
    • http://apart1day.ru/file/jodipevabudaviwibi.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/jawidodukerepumakezitova.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/wenefukekesaviranizu.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/95860532547.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f89e9d4e41---japolidulilevarekupoga.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/89347842003.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/jaluzov.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/93900337827.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/18210279173.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210907_DAEA0AC6AC7192A5.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=note+10+call+recordingPDF link annotation
    • https://lapdonline.org/file/nitisutelamaxerovaruza.pdfIn PDF document text
    • 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_off0000cc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC06 17364 bytes
SHA-256: 67483d40cda5b07ae1c55f4de0b740ed229bacfeafab7811cbdedc64180df44b
font_01_sfnt_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 10528 bytes
SHA-256: 5737980237f1ea589f22cae72d44a6e43fc044487cc45a4d11fedf98398ebe6f
font_02_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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