PDF malware analysis — malicious · 567e81a7072bce67

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 17:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 199f132fa00f0e266cf26eded4985039 SHA-1: 4851967200c5999080c53e542602ada6abec330b SHA-256: 567e81a7072bce679d9498fb24a1f731e172fae64c0cc9cf529f7df31a4043e3

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by an ML classifier as malicious. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious or SEO-manipulated content hosted on these compromised sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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 https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/653c78ade2d1fd351f366f925224d266/41325693022.pdf In PDF document text
- http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608742c1eb0ba---4013894292.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2nm5o52tgrskkqggv8nsn3dtmt/gowaxegejirugipezukomol.pdfIn PDF document text
- https://mastirz.com/userfiles/files/rowirafanogopetikadozig.pdfIn PDF document text
- https://1877painters.com/FCKeditor/file/kusezujuxiwojoxuvari.pdfIn PDF document text
- http://lycee-elm.org/userfiles/file/17885718155.pdfIn PDF document text
- http://tropo-design.com/ckfinder/userfiles/files/74615107383.pdfIn PDF document text
- http://jjburgerut.com/uploads/files/60763483810.pdfIn PDF document text
- http://finproekt-msk.ru/userfiles/file/90021722211.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee69938949---doxowokejilipop.pdfIn PDF document text
- http://kdbelektrotechniek.nl/uploads/file/morovulab.pdfIn PDF document text
- http://cuanhomkinhtoanthang.com/media/file/75158761556.pdfIn PDF document text
- http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/71021de2e9dfade82c2a4ed4386fb33e/54941812057.pdfIn PDF document text
- http://babywagen24.de/userfiles/file/vexebekuforetav.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d56beaba7ea---92112750094.pdfIn PDF document text
- https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8fb8b5b2a00a6d70da70e8e719e42a5f/tuleruzuzosumefumiti.pdfIn PDF document text
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8f325efdd14e506a3f1b70be39cd2ef8/bujupufupaji.pdfIn PDF document text
- http://evergladesharvesting.com/ckfinder/userfiles/files/61201570244.pdfIn PDF document text
- http://iweldbot.com/ckfinder/pho/files/vefak.pdfIn PDF document text
- http://ustunongel.com/image/files/24906893134.pdfIn PDF document text
- http://pastadimatteo.com/ckfinder/userfiles/files/3542922148.pdfIn PDF document text
- https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/1489d5bac229b32bdb46b5a573b99fa2/43039956484.pdfIn PDF document text
- http://primebrokeragetx.com/ckfinder/userfiles/files/povavusuvep.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d92558ec296---34545398998.pdfIn PDF document text
- http://agendatourvietnam.com/hinhanh/file/52430559347.pdfIn PDF document text
- https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/6bfeb3f4b3de0b82cdcf251ead6acbd5/29746424580.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=indefinite+pronoun+worksheets+pdfPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cfc6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFC6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e7d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7D8	18012 bytes
SHA-256: `6bd5b51c95690aafc7c2e4c9b9848c787bd985bacbf8d62597aac4dd03263026`
`font_02_sfnt_off000115c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115C6	10616 bytes
SHA-256: `4074a6d1e9140c7f2d94b920fe668fb6445988bf692531b524bc06a68fc88f04`

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