PDF malware analysis — malicious · 0ff93bbc66a5de6b

MALICIOUS

PDF

89.4 KB Created: 2021-06-27 18:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 28a7583a46a61acc2f5170a0cb5095e9 SHA-1: 058ec6d686486ebdc3d9d4bfc830ec31107f9863 SHA-256: 0ff93bbc66a5de6b72b6bb41c79acbe95963b85f9bd114fd11d75914356ad01f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute phishing content or further malware payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=the+period+of+a+function+is+measured+as PDF link annotation
- http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d07f5505f---92439977769.pdfIn PDF document text
- https://apz-arte.com/ckfinder/userfiles/files/sadafikugalurugul.pdfIn PDF document text
- https://marosme.ro/hirek/file/diparero.pdfIn PDF document text
- http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072682589087---rejumixelolanitili.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5b24223b5---1273528942.pdfIn PDF document text
- http://kozszemle.hu/uploads/files/46422424463.pdfIn PDF document text
- https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/1qeuuohdiigh49970jhhsp2td1/55139482710.pdfIn PDF document text
- https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/af854fbe7af8bab3babf742f95d21cb1/62238053244.pdfIn PDF document text
- http://ytbozhuo.com/upload/file/272220552279.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d85029c6d7164a79f014430a1e7878a7/dubidopemumepera.pdfIn PDF document text
- http://carszana.com/image/upload/File/suwozamagonetilo.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b46c0e1dd---27353729647.pdfIn PDF document text
- http://barcelonahotel.vn/UpLoadFile/file/kotusofiriguwatuji.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/dadb2c08e8ef197bc7f043bcaf8f5162/43521721421.pdfIn PDF document text
- http://sowitech.vn/upload/files/subavaje.pdfIn PDF document text
- https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/dc4c70a4e49bb24e1a02ee55d9c4a024/tigolafabedupowuv.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f155f412---tudamuton.pdfIn PDF document text
- https://cutandcolorparrucchieri.it/file/6005981985.pdfIn PDF document text
- http://gymostrov.org/gymostrov/userfiles/file/jetitupugadovuzeme.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3ea3a7933b2fa7dc25525b8447323469/zafolagup.pdfIn PDF document text
- http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/dufubimapofevoxeki.pdfIn PDF document text
- http://lulanjina.net/upload/files/74606758904.pdfIn PDF document text
- https://bodegoncriollo.com/userfiles/file/66546661466.pdfIn PDF document text
- https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/831f00cfaf07aaf6ab09af1f75a9f172/8838382536.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_off0000f859.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF859	10904 bytes
SHA-256: `9e766284f0e3f044b25f3f570d270d90ac65f0d3d160503f7c6a877f8c6f05af`
`font_01_sfnt_off00011166.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11166	17796 bytes
SHA-256: `1590c40ffe6c1e302c4aaef6e4bf2671c8adc94f6ed32ea4b91839256110e6d7`
`font_02_sfnt_off00013ff9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13FF9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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