Malicious PDF — malware analysis report

Static analysis result for SHA-256 08447f297ed0520f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 09:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb5fef87c40c1792456def058d658bf0 SHA-1: 7e69c1a7cb20eee2a68acfdeadec6a7890069406 SHA-256: 08447f297ed0520f46105f1a403700aecb86789df6977aa0b5dc840122ab0c7b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary attack pattern involves directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • 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.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e835fc1210---zebosotoka.pdf In PDF document text
    • http://baigeleather.com/userfiles/file/80972402966.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b996c5b564---14322574296.pdfIn PDF document text
    • https://majubesar.net/contents//files/5425887419.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fc368237e82807b6601f8f6b74799b4f/542415429.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/11346884091.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/xifikasisejijex.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/49734913604.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0e5016e2---74477124051.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cf701f8a0---44046473158.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160797d452a193---60523275932.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/980a0fd387ec166daea6ae840ca9da07/26814389165.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/denape.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/bojefojuba.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/54119383098.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/3451261262.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/6ef525e83f35470d0550728ea3f97d64/xuzapetumuwojorelopez.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9fb2e19d8---10410538308.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/5f19f9e4892d595e3a1d3c0d5ee4497a/dukewazidu.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/situnopurokeb.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/12004249212.pdfIn PDF document text
    • http://halmar.info/userfiles/file/2566372267.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd55b3b39---jetijokumazaresuxufepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hausa+language+translation+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_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 10764 bytes
SHA-256: 656634cf7fb8d6504bbcfeb3c9d831e06edd31686dd3948523beeb9081fbee26
font_02_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 21248 bytes
SHA-256: 8e834381644678721f9c9f327e7dabd78e9220789205ba7aa7a1c8b135f28eeb