Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45e9c04bcb4698c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 07:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e146c35f4a0bf73a38b3de99296131d9 SHA-1: de91aec5f189570dbe8d1953835584476aa13508 SHA-256: c45e9c04bcb4698c5b91e1bfabaf1752ac0497ec843a4c5619b74c5898aac71b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://pixomot.ru/uplcv?utm_term=wifi+software+for+android PDF link annotation
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613091127dbd0---demaselejil.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/bivojotakiluxo.pdfIn PDF document text
    • https://medpressa.ru/files/file/marowafu.pdfIn PDF document text
    • https://zhansq.cn/upload/file/lekusuxiwur.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ee032ac0c---88466046674.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/nanejaniliwakavape.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/kanisapa.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613171be1c78f---remabobogi.pdfIn PDF document text
    • http://tercovci.cz/files/file/51909150508.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/vigirukuse.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/wubafami.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/50989619143.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141124197f63---wokatome.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/pesipesamexo.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/xokagosubalitadusuxiroviv.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/94756581621.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/48994326121.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/93393670279.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/52660910855.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8913235778cc9a4ee9acb2409e95af9f/vaduguziwiva.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/71759705531.pdfIn PDF document text
    • https://grouptm2.com/contents/files/maxerezolegakotapifefivax.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/24365359328.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_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 10380 bytes
SHA-256: e6ecbd2b9f7312a8c6d85fac3910499a9cc4dd22e69af9bf747d6ca5286b259f
font_02_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 17648 bytes
SHA-256: 7b47ae6ff3f6f9b078da3000fb1c8151bf2a974094ae6f2d63efa551ec1276fd

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