Malicious PDF — malware analysis report

Static analysis result for SHA-256 a073207ef65ee44b…

MALICIOUS

PDF

91.3 KB Created: 2021-09-08 07:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5aef2462356d368ed612427976ffab63 SHA-1: 19f167e64226bb093a442bb8a2879853762d446a SHA-256: a073207ef65ee44b79bd5f475cc36b3b1510ec60c28268d1eb7cc1be94ca463a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

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 https://philabc.ru/uplcv?utm_term=filtration+process+in+water+treatment+pdf PDF link annotation
    • http://renovfab-menuiserie.com/userfiles/file/siwami.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/5p3npkg2rbk0vd99f3ff96jhqd/luwozafobikikexadepizo.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/60887813183.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/54895812597.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/456e397ab06d828f1e9646982c2fa29f/porelorowejotiwo.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/suvakopop.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/vateridepagedigewibeniz.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/mefufuxarotutuw.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/55088333462.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ddf4bfd8---ratedod.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/v2gl4isjtg6uencspe7hckgu1f/bifavefewot.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/34502bbf302f896a655f89f18d250a82/58530519751.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fcccaff01---20886726955.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ag2cn2jgdbi9lo1fbr3cs01nv2/vazisasurojelokera.pdfIn PDF document text
    • https://egca.fr/userfiles/file/nobunigefobatobeva.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/11106462863.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/97432124795.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/199eb0e800f8e87417d02d06f59e6a80/walazusojirir.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/65447970315.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa3ddb7931---wusudaret.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/gepizatizibitoji.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c654c5f0---dagojuxi.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_off0000ff74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 18104 bytes
SHA-256: 4ccc3d542d91c62ae4d7e297032ef67f0921d0405f30807456993d6d755f2b5d
font_01_sfnt_off00012e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E69 10844 bytes
SHA-256: d7aee496be808d933807a309c875be1987179e230dd6c6247522265f88b376db
font_02_sfnt_off00014773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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