Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af8ec5c8cdd841c…

MALICIOUS

PDF

80.7 KB Created: 2021-06-28 20:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a0b236491620e83e61a9d9bd5021ef7 SHA-1: c4aa22274406fe3f4126938aac22fd29d2e3dee2 SHA-256: 4af8ec5c8cdd841c2cbe6d918a8c2d8f368940c7ee2bd511b906f93a9e5536b9
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://africanresearchcenter.com/userfiles/file/ladavamimuwefujepakogiz.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096ba9e62ff2---57068749824.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/154e1dbae01933f8037291b1c330b796/67249060675.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28f37178da---lupila.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a544c42eab2---41284459329.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/58cea3298753193cb86ead1eefacf704/51911985082.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48a2663c5---58972457575.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8639353545.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b4842cfc1---81226947678.pdf
    • http://tinhdaurosa.com/Images_upload/files/65390135595.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/40576310364.pdf
    • http://cpspcb.com/uploads/files/tafeferidukexiguwapag.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3ce5a749ce2a7bf70380bab4c54338c6/39384055388.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97bbcec5a---rebexaruxureje.pdf
    • http://vce34.ru/attachments/file/mezefogokoponimez.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1e2a9a2f9a244de0b275c72fe1794a6e/84473293544.pdf
    • http://jdhs77.com/clients/58520/File/fivefonupunivezaz.pdf
    • http://expresskaliski.info/file/88938532873.pdf
    • http://airconbank.com/upload/fckeditor/file/17144331958.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff0e3f327---61736439615.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/feea2bf601cbec4f422231e471049ed8/roxikakawamabinapabo.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d54ce3deb---tajisiw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=wallace+%26+gromit%27s+grand+adventures+steam
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daee.bin
360f16549666346f9ab4d45c64f2323fe57c5e19eeba5aac62f93a2a6411150e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 18184 bytes
font_01_sfnt_off0001097f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 16792 bytes
font_02_sfnt_off00012195.bin
754d18c0b9e5dc346afbd8be06c4bef3986178ced8898d90050eb8e5406579f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 9528 bytes