Malicious PDF — malware analysis report

Static analysis result for SHA-256 e731397ea93564ae…

MALICIOUS

PDF

85.4 KB Created: 2021-09-10 04:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b66d41cae4ce0a8855658f21f691ff45 SHA-1: 542a5ca0849592f65a4a788679327a48f64e2c67 SHA-256: e731397ea93564ae2ab878c6d864a01358c537553ee37e6f1e6407c06426e5e3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://rockpapersun.com/upload_mce_image/file/77156382770.pdf In PDF document text
    • https://curvy.tw/upload/files/69616812632.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/83649413610.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/vopubawexo.pdfIn PDF document text
    • http://oodow.cn/upload/file/210904191109286999cvfws8urd23w.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/jodagazolomowi.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/safitorunajodurunegadi.pdfIn PDF document text
    • https://12shio4.com/contents/files/mitekefi.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/femizexogezaju.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/28206355467.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/radiligomowifojutololuto.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/97e210d88b8c0afe97fa77f029161552/36785674455.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/zegipubofof.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/7355982830.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/92bihbccmisgub1hvjndhjp8m1/22701850362.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/45882559889.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/fafuf.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/60015544841.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/78089123002.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/61774697402.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327fca6dbff---donowuxepedumenabunos.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/45006395795.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/dbcf5416b11ea0cb7a00c9ddc8e40568/lutewovuzajodegad.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210904_977FEBF125227CA8.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/30344923672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=desert+animals+and+plants+namesPDF 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_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 17900 bytes
SHA-256: e00d0919aad4cba5c11ff0f5adc490d66c6b08a16a03ac50f3178f63bd4d4b50
font_01_sfnt_off00011841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11841 10436 bytes
SHA-256: b72f1d4a66d6c8bf33557040f30c1c0c3f60d6ccfe0321e65e05ed7cd6c301c3
font_02_sfnt_off00012fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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