Malicious PDF — malware analysis report

Static analysis result for SHA-256 49dbe991d0191311…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 01:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8896a8208aaf5522f25b75e8a5efc682 SHA-1: f32bfafe0c4ba146d5ecd013ea4d8c6d9f7c513f SHA-256: 49dbe991d01913111aa1963d93c63031061fa3bb1a9b5408c851f2fb0ed2d468
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the presence of numerous links and the overall heuristic analysis strongly indicate a phishing or malware distribution attempt.

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 http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210908235607.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1ce8573c008ed57705a06384e5812f2c/48935160435.pdfIn PDF document text
    • https://artenika.pl/fck/file/buwuzosos.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/kadabuxadatox.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2a721d81---xobaferubusevewu.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/73356489944.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/24431719782.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/74829764244.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/xugasimebinuna.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/jibuxazunutabegixetuvig.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/bununuruga.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/logijodurizigaxel.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143c6c3cc3b0---45387982855.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/21439446817.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/67191970222.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/70344399783.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/ravija.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/73907907139.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/cd3652f00a7a2716ece6ca3861c91826/jofeb.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145dd342a028---24925305964.pdfIn PDF document text
    • https://gangnampools.com/contents/files/56208522314.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/fidowafexidi.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/92979569232.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/81000165639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=programa+para+correr+aplicaciones+android+en+pcPDF 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_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 10760 bytes
SHA-256: b750f438256ae0b1cb22f4c38d237b8777707b4fa88f6d4d86ae9c32dd4a38f2
font_01_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FF 19152 bytes
SHA-256: b4c1961a7a0b2566174db20d4fa9082d432e7a4a1007c54eb46e41bf64707ba7

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