PDF malware analysis — malicious · c70b46fb2841183a

MALICIOUS

PDF

75.9 KB Created: 2021-09-17 02:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 072e421912af34bb2ba7270d4cfdacfd SHA-1: 8feca2abae06fb2613641e894aa5b079d15872f1 SHA-256: c70b46fb2841183aec6d1c7a9dfac0ca4a3d0d083b03903db92b7519ad4a1296

136 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous websites, many hosted on compromised WordPress installations, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicates maliciousness, and the 'Password-protected archive handoff' heuristic suggests a common tactic to bypass security filters by encrypting the actual payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 6

Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://cructi.ru/uplcv?utm_term=gta+5+apk+download+for+android+highly+compressed PDF link annotation
- https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f44ac6c52b22595235f0367705da14d9/forijuvukonavokopidonidif.pdfIn PDF document text
- https://demo-calson.garment-pro.com/ckfinder/userfiles/files/webaxew.pdfIn PDF document text
- http://elite-nails.pl/Upload/file/64026594014.pdfIn PDF document text
- https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/fuwejidiwuti.pdfIn PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/35eknqqoddbufiudp53oeo137r/2209707655.pdfIn PDF document text
- https://greenlandpark.com/uploads/files/xepilupabugipizaraviwi.pdfIn PDF document text
- https://tagoproperties.com/ckfinder/userfiles/files/20844852025.pdfIn PDF document text
- http://www.ondebiz.com/userfiles/file/redumovidokozetevuji.pdfIn PDF document text
- http://dongphat.net/upload/files/zorivigetojibugupozem.pdfIn PDF document text
- https://gangnampools.com/contents/files/kobofofikabapuwetelu.pdfIn PDF document text
- https://bankubezpieczen.pl/userfiles/file/83578630888.pdfIn PDF document text
- https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143c348ebd73---59694170394.pdfIn PDF document text
- http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/76646602869.pdfIn PDF document text
- http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/xowegimelavew.pdfIn PDF document text
- http://efuturesthai.com/uploads/files/60343017421.pdfIn PDF document text
- http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/d55eglkim5d9hlj3sk92oc8rp1/88698393447.pdfIn PDF document text
- http://nickelsgrafikdesign.de/ckfinder/userfiles/files/ravidemifalu.pdfIn PDF document text
- https://csam-villepinte.org/uploads/images/file/luzagopamataxosokuzope.pdfIn PDF document text
- http://mrybalko.ru/files/fuganivasatuwomejo.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613391304190c---48092661599.pdfIn PDF document text
- http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/pizujine.pdfIn PDF document text
- https://pcetravel.com/files/file/16633881341.pdfIn PDF document text
- https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hoetnbcoqup18h84b9r6qcror7/31132703590.pdfIn PDF document text
- http://avesta-hmora.boj.se/uploads/userfiles/files/duwowiladis.pdfIn PDF document text
- 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_off0000c0e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC0E5	17628 bytes
SHA-256: `a7ba0d3b210a75c414e147d513936a5ba8f84ea2031e9906e297ecfbea8bc471`
`font_01_sfnt_off0000ee72.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE72	11532 bytes
SHA-256: `1caf0820b58fb1da195a449c9f2e1123b78a062cf53fc6e8a8357b5bf6016e70`
`font_02_sfnt_off00010988.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10988	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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