Malicious PDF — malware analysis report

Static analysis result for SHA-256 f525c96f72a64232…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 13:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64ec5c5845dd3c5bb382d348a21c5bc0 SHA-1: 9334f73fc648013a5e053c55a4e8e1a772ef35c2 SHA-256: f525c96f72a64232e9bd6be6ec9a3dac882e7448b41fb1ed5e0e46dd212088ff
96 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and URL distribution suggest an attempt to lure users to potentially malicious sites, possibly as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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://constantemail.com/userfiles/file/1631721314371613851.pdf In PDF document text
    • http://sarkanyhajo.hu/files/file/noxugajajuduzuxeriwovar.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/55463270504.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/masasa.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/16539872988.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d71ff3a46---46137540790.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613af4c833f1e---39134512256.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/retiduji.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/5254836348.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/nigofiduvite.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/32478134323.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/gowopadapejepapagowa.pdfIn PDF document text
    • http://btfa.tw/upload/files/63832327566.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51711894731.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/sewavevak.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404524cfb38---zofekoxiduwapibusevajuxe.pdfIn PDF document text
    • http://a-pluset.com/userfiles/xozebuxunusakutejo.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/62345922180.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/64423247947.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210908_030915.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ee0d6deba9515d38853d693af26c4399/12476462041.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/06/kadegigaxuwomiwuzapotudor.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/89584518407.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b96fd8fce87701265127dd460a015b6c/jefosumexomogo.pdfIn PDF document text
    • http://melabo.com/upload/files/67727530602.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161454543d4e90---66629436401.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5f3ecba88---54842629677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+bios+damonps2PDF 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_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 18852 bytes
SHA-256: 5c4fb03d0870174a9bc289bfd92779e2c8336decd5262b207e24ba474cc5c503
font_01_sfnt_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 10568 bytes
SHA-256: d2ac5d4c932007c4e0113d835f75d8757bbd3099e31dead2fa0f1e3ee1fc602d
font_02_sfnt_off00012a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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