PDF malware analysis — malicious · 7aaadadb24c35a4b

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 17:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: ea201178c85673047b818435c69a0a63 SHA-1: d8164afe9b8f319b2817556de91120ecc9228139 SHA-256: 7aaadadb24c35a4b053f57cdc7b5c52d376a52e8aca14673d14da487806e5a8c

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains multiple links to external websites, several of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm used for phishing. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically indicates an attempt to impersonate Apple and lure users to the URL 'https://medvor.ru/uplcv?utm_term=how+to+get+new+dl+if+lost'. No scripts were extracted, but the presence of external links and the phishing lure strongly indicate a credential harvesting attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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
Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH

Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://medvor.ru/uplcv?utm_term=how+to+get+new+dl+if+lost.
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://medvor.ru/uplcv?utm_term=how+to+get+new+dl+if+lost PDF link annotation
- https://isleo.com/i_photos/file/suvokamudovugew.pdfIn PDF document text
- http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5581c35758---sobikujatomisizi.pdfIn PDF document text
- http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804c41f236d---zepiwifutavuzeranugota.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609650394aeaa---65440115574.pdfIn PDF document text
- http://unseretochter.ch/images/file/64115625538.pdfIn PDF document text
- http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d27cfb2d---worizunonifi.pdfIn PDF document text
- https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52d6bbc33b74fcd7ceadb556391d9a0d/xugixugarikox.pdfIn PDF document text
- http://dfh-consulting.com/userfiles/file/50849795024.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bd9f0f2f---toxazomuxegegikefafosiwa.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de2f3eeef0---82155688852.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d2a1880e---68485948492.pdfIn PDF document text
- https://steklo-shik.ru/userfiles/file/nuvuje.pdfIn PDF document text
- http://petra-dario.info/upload/datoteke/2491103254.pdfIn PDF document text
- https://xn--80afc2apd5n.xn--j1amh/upload/files/39772210825.pdfIn PDF document text
- https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/93009c16c9f0d04dd6af03a05806b350/77624064812.pdfIn PDF document text
- http://granite1962.com/clients/869125/File/84557491321.pdfIn PDF document text
- https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/bc1e94b9efc5e1ca875076abb635380c/muzupebetebefe.pdfIn PDF document text
- https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f7bba6cdc37b01843da5befc0d438cc6/65676544570.pdfIn PDF document text
- https://an-professional.ru/img/files/file/welisavimezisijonex.pdfIn PDF document text
- https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080877b91c57---80441110740.pdfIn PDF document text
- https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/a6f7ngrmqmfba4dm29fqgk4luf/netewipisosuribelozuget.pdfIn PDF document text
- http://bkbflooringusa.com/userfile/abbey/file/zuwaxufafe.pdfIn PDF document text
- https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/23a5bd1fabc53915284e87bf68f89c35/vipadukivubobagej.pdfIn PDF document text
- http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27052ed9f---55957877113.pdfIn PDF document text
- https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a0e4abef904a6057d827b6839668af37/33819951657.pdfIn PDF document text
- https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/8545d0fb8d49a7c58aa571f92fa1df6a/30152748657.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_off0000e8b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8B6	10344 bytes
SHA-256: `62c2d69020087d45acac05234ea28159ab31d3f96cc233027b26f373ff0fcf3f`
`font_01_sfnt_off0000fff9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFF9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001180b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1180B	16840 bytes
SHA-256: `8dbf2bba0068f59fb5fbc8f17f25696fdf8b3eeda1dedd129dcdb84f089cac0c`

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