Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae68e978d2b7491…

MALICIOUS

PDF

69.8 KB Created: 2021-09-23 14:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 468d8afeea326a36e6a875102c73f5d2 SHA-1: 00b88a49df8e4b444066ab40983d389629bb607f SHA-256: eae68e978d2b74919a09c35965a364f5adeffba5baf7d758d18eb8f67f4a365f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or malicious redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://massintech.ru/img/outer/files/momixofisuzujidifegam.pdf In PDF document text
    • https://etest.vn/app/webroot/uploads/files/58329183827.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/5080560259.pdfIn PDF document text
    • http://protok.pro/upload/files/fuwiwetafojidogikupu.pdfIn PDF document text
    • http://otczenacts.com/media/files/dubefiburugopuvojot.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/giledaterirovirekope.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142fb055e477---97332999680.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9eb6dc36---lebagadogo.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/bororebenuwukiradeza.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/salomubesesok.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/gutenawadudozop.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/nijewiza.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/88483616094.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/as442h1l1tlgtrk9mn3c2crd85/zopofivanabikusigab.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c1a4253b41082e3cadfcd6f66d0e3546/vipomovavumuxosanipujasu.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/sanizelazemepefodapa.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210910_152713.pdfIn PDF document text
    • http://www.polni.si/Images/files/76173328471.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/xugawepefeko.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/65500118116.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/muzedopibenaxe.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/50390907398.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149300b8146d---39263158989.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/13224025285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+connect+ipod+to+android+phone+via+bluetoothPDF link annotation
    • http://tes-sys.com/uploads/ckfinder/files/20210914/16315585024135.pdfIn PDF document text
    • 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_off0000b397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB397 14684 bytes
SHA-256: 98219c6a1cdb567704de6bdd4fcf4ae7e8a402ae25f9601f9a981332603baaa8
font_01_sfnt_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 10824 bytes
SHA-256: 16b468603578360a4739c82e55a099b01f690f8f7c6087f6bbd72c7b6d1d44fc
font_02_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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