PDF malware analysis — malicious · e787951c2e97ce10

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 05:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 401e6aba769d25ca714cec7fe0a698e4 SHA-1: b1294ff4a42c1ac31405c8defd32b8c41ae10095 SHA-256: e787951c2e97ce1082ea62ba0cc7568c52284144ddac43f4aad5cfa2084af42f

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains JavaScript that is likely intended to redirect the user to a malicious URL. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

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.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://materialdeestudo.top/userfiles/files/kozowofedav.pdf In PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/4fc56a49f820906c42cec1f3053ec164/82047914752.pdfIn PDF document text
- https://carparts-fixture.com/file/file/60206041513.pdfIn PDF document text
- http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26280024923.pdfIn PDF document text
- https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/t2n1p84nvjafsb5voocr2l8vsl/99449468512.pdfIn PDF document text
- http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8b935e71d---wetadovipexuvetikosa.pdfIn PDF document text
- http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/sifomofafiwikip.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a60bd15b60ccf97924242331a3d040d9/xadolebuz.pdfIn PDF document text
- https://nhakhoaanphuoc.vn/uploads/files/nuwosifokujaxevuruwonob.pdfIn PDF document text
- https://oceanflowerhotel.com/uploads/image/files/fixutarabafax.pdfIn PDF document text
- http://automsystem.com/UploadFile/file/20210717133427606.pdfIn PDF document text
- http://ankaser.com/userfiles/file/46388679265.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3e14a576ce8804136848c2326a0a5b05/22971723577.pdfIn PDF document text
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afebed699e3---13769621043.pdfIn PDF document text
- http://hangtatmj.com/userfiles/vigejexuzul.pdfIn PDF document text
- https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/cf39bf0256c6e3fac1c8c6fadeb73e62/66258978045.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be66cd731---67966168004.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/kgtpsppu6guquf0m7a2kf3vb07/vudidopexididuniwi.pdfIn PDF document text
- https://behagi.eus/files/galeria/files/86836690281.pdfIn PDF document text
- https://amursvoidom.ru/media/files/92000869325.pdfIn PDF document text
- http://arslanemlak.com/E/file/87598495084.pdfIn PDF document text
- http://artdealer.vn/upload/fckimagesfile/41f962a4a01d360400f9cda812e7f7a8.pdfIn PDF document text
- http://wami.cc/data/files/60506174536.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/012f0afeb1b437b8b4c0a9d15f24462d/50607801977.pdfIn PDF document text
- http://tonyprins.nl/images/uploads/file/sadasipup.pdfIn PDF document text
- https://store-connector.com/_upload_bilder/_filemanager/file/dufapijunizeniroturojo.pdfIn PDF document text
- http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/37444729321.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=anemia+perniciosa+tratamiento+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_off0000e7bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7BC	19260 bytes
SHA-256: `6610e949acb74025bed427115de2658d75f380e9aea567e0c1def5200c5fcce9`
`font_01_sfnt_off00011928.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11928	10716 bytes
SHA-256: `f22f91dd7a6a8207868e8e44cf2137f4fcd10eaaafad8926d0c971aa01eb621e`
`font_02_sfnt_off000131c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131C8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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