Malicious PDF — malware analysis report

Static analysis result for SHA-256 54eb3a15f6985360…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 22:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f976a497f178d72b1a88606337c4aec6 SHA-1: 495e732c26679025e1dd688ac57d9f81183d93bd SHA-256: 54eb3a15f6985360b47d8d31572f90aee9387ef647d8a4b90b981d498ffe6793
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The embedded JavaScript may be used to further obfuscate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8c0e2f59c58496a5d1615c3b9d1f99de/bumoripidixuxabagumire.pdf In PDF document text
    • http://elektromig.pl/userfiles/file/47179694390.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f5890058d---69258107785.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/toduvadidagedulipinor.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611694a359430---gisuxafumebureselu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160701e74a0852---waleg.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c2aa6738fd39179ee7905325159f224f/denenesajomitax.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d5f65802560887492045a8f459dce141/74230148017.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/zimopusapevimox.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/35254358571.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/13617961924.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a1b35df6c1b893480ff935d8f9439398/rogedugerawojix.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/sapafofujerodav.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0r5k28jebe6hlq7dn018h9aicc/41847347172.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/bijipaposopu.pdfIn PDF document text
    • https://soliangco.com/contents//files/38696347187.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/tuvetewegiwijavubenanewa.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/jotoraboxedezumuwub.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/puxikaxogomip.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/05166e29e1e56bf65524cc77dc27edf7/putofunosasorason.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f3d1083e6---45149117452.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/16265184867.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/96783870436.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/jopejivus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=water+cycle+fill+in+the+blank+worksheet+answersPDF 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_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 10856 bytes
SHA-256: fa0a661104d46cf1e0b7d04b811ca057c99659469394483f703c7ca7d9f92ff2
font_01_sfnt_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 18168 bytes
SHA-256: 9d293e3ac58a7d32661c399ae518c494f4a7bef3697b402fb30ccc83cf13c171
font_02_sfnt_off0001255b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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