Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acd7fcc50f86385…

MALICIOUS

PDF

80.2 KB Created: 2021-09-24 00:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c2859a1a072df2f398329a01c0db666 SHA-1: 0f4e1e4ce2ecff5c9dce2b81ec3bdd9d4a164711 SHA-256: 3acd7fcc50f863859de640e11e3855589cc0460c57be9cd1bdb50972e828f136
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bloomland.com/sites/bloomland.com/files/pokenasufabilewexamuro.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613380ae328aa---31014112967.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/81643193882.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/55804012899.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/27943860121.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/89064706028.pdfIn PDF document text
    • http://maulich.vn/attachment/files/15097545207.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/8gkthefd6l40iafjbjcvv6b3ir/tekoxotifekijefomut.pdfIn PDF document text
    • https://premium-house.uz/images/file/soxeraperekutaw.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/rabugilotuw.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/908e0d1d9e4851f95ec75bd103036e58/42421303773.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/93906721221.pdfIn PDF document text
    • https://efnnma.org/files/file/duxepokomebiweg.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/90313902773.pdfIn PDF document text
    • https://dm288.rs/slicice/file/7161713198.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/joramolilotoga.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404050a2808---tetunine.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/33082063090.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/39326276107.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/75038711598.pdfIn PDF document text
    • http://chinalabware.es/d/files/84482513990.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/tiribitodiforo.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/82549881446.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133eaa192533---42969005162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=usb+headset+on+androidPDF 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_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 17172 bytes
SHA-256: 0631f07d93c7d5a04182dfe3b038480307a893032070efeaf63d3d52d2f1a133
font_02_sfnt_off00011bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD1 10448 bytes
SHA-256: 3b9369bf0d97f55789582c593ba86ba0ed6e482524b068ec537a558e57c8e942

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