PDF malware analysis — malicious · 431b77292d6e6be1

MALICIOUS

PDF

76.1 KB Created: 2021-09-07 20:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: de2fbde8dd98feb1d34f9b0e7a9ce4da SHA-1: 07bb0add68b84d1695afb215b4c229f350dc387c SHA-256: 431b77292d6e6be1dfed119620bdde514f117bdd3ea9acce7ad516567f8942ce

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

Heuristics 6

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.
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://pistant.ru/uplcv?utm_term=leitura+de+poesia+alfredo+bosi+pdf PDF link annotation
- http://artgraf24.pl/userfiles/file/weladivonunazevisub.pdfIn PDF document text
- http://bellsazshihtzu.com/clients/878694/File/93456470997.pdfIn PDF document text
- http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/51332078007.pdfIn PDF document text
- https://www.lipca.com/ckfinder/userfiles/files/7415212463.pdfIn PDF document text
- http://nhs-carpediem.com/clients/46367/File/3667313005.pdfIn PDF document text
- https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/mavok.pdfIn PDF document text
- https://ncsccalgary.com/userfiles/files/54911249336.pdfIn PDF document text
- http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210812_AB85C026AAEE8963.pdfIn PDF document text
- https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a76122ed9840f10cfcd0a0d80e8d8f09/zoxekij.pdfIn PDF document text
- http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gigisavegutozikumub.pdfIn PDF document text
- http://insureacompany.com/userfiles/file/3637738536.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ea4ca38dd---libefilujidi.pdfIn PDF document text
- https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f6853367f---58161669878.pdfIn PDF document text
- http://beiks.info/public/file/19103455108.pdfIn PDF document text
- https://cambodiadriverservice.com/userfiles/file/46224818175.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/15ci646aithid38ddkpq160s7t/nevivenobag.pdfIn PDF document text
- https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/269c79f6d7b7c64f17e34f9be19b4a9a/kekerumiguramosegerir.pdfIn PDF document text
- http://cosyromania.com/media/file/82665079040.pdfIn PDF document text
- http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff2b91748e---mabatidawapulomufun.pdfIn PDF document text
- http://perilatomsk.ru/ckfinder/userfiles/files/vewoduxoxowol.pdfIn PDF document text
- http://oecschool.com/userfiles/file/sijuvivijufojemagixew.pdfIn PDF document text
- http://sluchatka-shop.cz/files/upload/files/nipomijodezejumada.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f7bb505319557df7e2ff639d31fa0651/dokesuvowujuxas.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_off0000c107.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC107	10584 bytes
SHA-256: `254515c7d455b5ce5d7eb59a458ecfcb2e3f31601c5d46f989086151025d965c`
`font_01_sfnt_off0000d912.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD912	19700 bytes
SHA-256: `2216182fc6f2a5ec4331004355edd6d04e5682d5974044e4344149a9b63e4a0c`
`font_02_sfnt_off00010a32.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A32	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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