PDF malware analysis — malicious · 39627d95fce7516d

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 18:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 6eda02851d89ed8fdf9089ab501d0086 SHA-1: 4297fcb6543ffd92e000b24ebb7b66036788a877 SHA-256: 39627d95fce7516dbb599f4ea29503edf549523224fdfa352044d9ea47a16f12

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of a link farm suggests an attempt to direct users to malicious websites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9885

Heuristics 5

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 http://bibliotekaszamocin.pl/img/upload/files/13049424836.pdf In PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0ecdef0d7---raburetijo.pdfIn PDF document text
- https://cebrigantina.com/025-CEB/images-editor/file/nijuxopokogavamapavon.pdfIn PDF document text
- http://mientrungpetrohotel.com/users/files/videjenizibemajefog.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56d13d923d---69335765670.pdfIn PDF document text
- https://chambres-hotes-aube-bleue.fr/userfiles/file/2402641716.pdfIn PDF document text
- http://creationart.hu/files/file/lolituw.pdfIn PDF document text
- https://aymfly.com/aym_image/files/78531651994.pdfIn PDF document text
- http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923e6ccab05---2983823355.pdfIn PDF document text
- https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66478f148---56644506811.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074900381ad5---kazudewegetugiwotagogugi.pdfIn PDF document text
- https://webhosting4.net/media/file/43746123475.pdfIn PDF document text
- https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab06b7073b---befeparef.pdfIn PDF document text
- http://slsnn.ru/content/files/74768125229.pdfIn PDF document text
- https://tenutaedone.com/filesUploads/file/58509559968.pdfIn PDF document text
- http://kompletucetnictvi.cz/files/file/mabadag.pdfIn PDF document text
- http://klick-tipp.info/ckfinder/userfiles/publics/files/95693408285.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c4f45f608---7306507053.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40560eff89---47436314952.pdfIn PDF document text
- https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/abe42c0f698f930333f4be66ec3af511/62068593190.pdfIn PDF document text
- http://usmleworkout.com/files/file/75865775319.pdfIn PDF document text
- https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/88b4rcc0he1v9os93n4t7jv46d/xiseguro.pdfIn PDF document text
- https://cs168.tw/upfiles/editor/files/ranulekenolu.pdfIn PDF document text
- https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/brf26a6ljbbn3siv187o1195g3/58139924942.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3h932ubabco0q4tuaok833cmb1/remanu.pdfIn PDF document text
- https://kurek-rowery.pl/user_pict/file/kubirenasazuwedanefor.pdfIn PDF document text
- http://grandinhr.eu/images/user/file/tajokagusosu.pdfIn PDF document text
- https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7ac9f84e8872220d1dea57fa06b16c7b/sizetemazogezosojali.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=perfect+english+grammar+reported+speech+mixed+exercisePDF 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_off0000c054.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC054	11172 bytes
SHA-256: `e705c52e29c0ecc59aa81e54571648eb2023e1ec3d26631fe911dec83153b3fa`
`font_01_sfnt_off0000da12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA12	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f224.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF224	16888 bytes
SHA-256: `35082e474048ec8bddf5d064323c71ce5cca6a7ab1c00bed541048c67d959c0f`

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