Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb24e54de8b7d7c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 01:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 509174484fe3792c0dce9b7df7d20191 SHA-1: 63fd667c19693de42f413cd4483be07331ebf591 SHA-256: 8cb24e54de8b7d7ca10c98959e7f493dc61fd423fcba844d0b46dcde7bad2af5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded URLs and the PDF's structure suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://phuquiland.com/upload/files/lewavopafibuvomejevigumo.pdf In PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88805366282.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/13544620156.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161339975a8f82---31343076524.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/86621523562.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613610bdcf8fe---78841903128.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135168deed53---mevagilaloveroxigi.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/bawek.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/nabujonofepojiwodivow.pdfIn PDF document text
    • https://ewt.cz/res/file/tudokokipisejepusuvakixi.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/3714740772.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/midubogosumiga.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/60025981453.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/29515942900.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/fafik.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/difaduxoboxemevipikajem.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/furumezijasopij.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/zadowelabefe.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/23988856926.pdfIn PDF document text
    • http://elitk.ru/_files/vorekabuwozibumifunepumix.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/65307031121.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/92900492509.pdfIn PDF document text
    • https://adci.vn/data/upload/file/64866690168.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132eeb235505---gelukulobajogumopafepov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=in+instagram+how+to+check+who+viewed+your+profilePDF 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_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 17632 bytes
SHA-256: 7336ccb149487968585d04f54cdd15a560c4d0af9468a66bdb612b876cff0bc3
font_02_sfnt_off00012836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12836 11476 bytes
SHA-256: a9e568bfefb436b8eb63dcba6b1a2b71467d4caa61e492246eb00ad3bff8c83f

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