PDF malware analysis — malicious · e048a4f50a3daf81

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 09:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: a600628b053ddc6e9ca958590732acb0 SHA-1: abf51f47d5b64b97491ecdc10960d1c8f6f7296c SHA-256: e048a4f50a3daf817f7b44fc598e151790aca63e6d887e53987fb50885d503c1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the file functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of numerous URLs, including those with 'utm_term' parameters suggesting SEO manipulation, points towards a phishing or malicious redirection scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=simple+arduino+uno+projects+pdf PDF link annotation
- https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7f88a85d67e7a0076519389e63156525/75150888042.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f5142854e87---52134237421.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160992b51ceb25---gosotafilisuko.pdfIn PDF document text
- https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/524f5b8bf6a4732e628356ec38c23a4b/rixugupemolemeda.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/a99e8ca4c564cd484eb19dddb8fb982d/milamokakigapumovoz.pdfIn PDF document text
- http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071e1ef51864---15979103867.pdfIn PDF document text
- https://digireg.si/upload/pebuge.pdfIn PDF document text
- http://eprdel.cz/userfiles/file/vajuj.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609025a024856---13035573687.pdfIn PDF document text
- http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/oc2laq1g0q2b1kuujaapv5i7s3/33148587430.pdfIn PDF document text
- https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c49a28c76f6---77776178962.pdfIn PDF document text
- https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a2c60082c---95319726752.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5b9775a9a608f9751e9491d2153556c1/gegurewifuwogamimoxa.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c679249181a---27989995126.pdfIn PDF document text
- http://meandnetworking.com/ckfinder/userfiles/files/duginesidoluzufelox.pdfIn PDF document text
- http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a81652bb35---pasolivipel.pdfIn PDF document text
- https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f6a6c5bdd760aa4d53de07c497a4163/zafumixalek.pdfIn PDF document text
- https://majorsagilekvaros.hu/uploads/file/90188026810.pdfIn PDF document text
- https://artlabjo.com/userfiles/file/47438360345.pdfIn PDF document text
- https://eltonltd.ru/sites/default/files/uploads/75158238297.pdfIn PDF document text
- https://fanaf.org/article_ressources/file/91790187057.pdfIn PDF document text
- http://www.ktgroup.co.uk/ckfinder/userfiles/files/golofuxipapawaze.pdfIn PDF document text
- https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7fd306d9a8ed5336a939191334c6d69/75109146534.pdfIn PDF document text
- http://phrabat.net/UserFiles/File/85502362307.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_off0000cd39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD39	11084 bytes
SHA-256: `c3eeb0bfa269d7dcf39de436d83ddd26e69f38decfec736fd7db10f17fe3cf83`
`font_01_sfnt_off0000e6fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6FA	17680 bytes
SHA-256: `48abeb5e3f8c749a545be12a286ef1d985b2bb546817b0cfffbddc4c32b764fd`
`font_02_sfnt_off00011507.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11507	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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