Malicious PDF — malware analysis report

Static analysis result for SHA-256 4151ea4fffad9d6a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 05:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a28f8b1f2aa5392684c817f11a3ccac SHA-1: b4ecb217795532c8cb54896e01cad3b7d8b82bc2 SHA-256: 4151ea4fffad9d6a4642fae1504f61d7be12e5deb548b9842023f5f7531fa360
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to direct users to potentially malicious content. ClamAV also detected this file as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links, aligning with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2548

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8bklaq76gpp7dhfq4er8649har/xinimoxetinowa.pdf
    • http://abwcrainhwy.com/uploads/files/1237373841.pdf
    • http://thuexedanang247.com/uploads/image/files/vafanaruvijaguluvi.pdf
    • http://morecoredesign.com/images/imageUps/files/16913320104.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sekisumotenabapakuluw.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/140101ca77de1bd1462374310433fad0/zonigidagusuxofotixoz.pdf
    • http://bebaldebaran.eu/userfiles/files/begolek.pdf
    • http://www.gonouvellezelande.com/files/92553190456.pdf
    • https://clubelsendero.com/img_pag/file/67508363610.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12b79b8ae---53169652010.pdf
    • http://kamerton.nl/clientfiles/tejebevumususoduge.pdf
    • http://strandedtattoo.info/file/87066199376.pdf
    • http://anm-av.de/uploads/files/laruvegafabiv.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362a2dab46e---77028602797.pdf
    • https://smshealthcareservices.com/ckfinder/userfiles/files/79127686047.pdf
    • http://szsahsh.com/uploads/files/kidig.pdf
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/41492661483.pdf
    • http://zh-huaxun.com/uploadfiles/files/dagawoseki.pdf
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/35025455454.pdf
    • http://familiegravesen.dk/userfiles/file/lepirapojanepu.pdf
    • http://ambartakip.net/belgeler/file/26732822541.pdf
    • http://rld-carbon.com/file/momokonejivaravugukosano.pdf
    • http://jeyadhurgatemple.com/userfiles/file/28152550944.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+game+pigeon+on+android
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a3.bin
8f0eae9ac8033bf0fefc226ec4c47d16c3c0d1ac2118cea9ad30b7f35eb3b602		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 16796 bytes
font_01_sfnt_off0001120a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 16792 bytes
font_02_sfnt_off00012a21.bin
9ed43e389b6b7df3f2cb9d7929f59d68c518e8b6b50702b13605a48b9c430e8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 10596 bytes

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