Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e6e731622f6aa04…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 18:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 71805d2f5a05292004a8435298f086be SHA-1: 7fefa2b9c6742e73a66bcccf4eb527d02b9336f9 SHA-256: 5e6e731622f6aa0478922a7e277101b222ce5452e91ee9a411cfb046cce2b8c2
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The primary function appears to be redirecting users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://medtek.vn/storage/file/mapovego.pdf In PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/dogisuwofetuxutoxu.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/xaxonajokikiv.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/67243508011.pdfIn PDF document text
    • http://enricobarraco.com/files/57740440256.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/vebixupaxikegib.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/38608682233.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/tptr287fcanedia3v7d9oosqt2/87066991598.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/wukon.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/makobavorijaxur.pdfIn PDF document text
    • http://cpils.com/userfiles/file/55077413841.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/50405574409.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/49130701543.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/kepazesagilojawiwudijuba.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/46957151243.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/72398419518.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/74bg840qdtvr5melccttd46drk/kebagipirawijak.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/bivogabikodupekevixakapa.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/53100618263.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210830121211.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f418973492---gotige.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/dakotufuta.pdfIn PDF document text
    • https://premiersuli.hu/files/files/siwanilegufezagatapif.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/11493901182.pdfIn PDF document text
    • https://virker-ikke.dk/files/bovulezefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+license+back+after+revokedPDF 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_off0000cec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC4 17744 bytes
SHA-256: c4fa48612c7120dffea992002fedaee6657e62ef12c76c8bc35fbd9b3ebf6ff7
font_01_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 11028 bytes
SHA-256: 77f4d8a450b8fedc3125e59d7d25826f068aa7821b20a41d46b8809e77ce2712
font_02_sfnt_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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