PDF malware analysis — malicious · a76039e2c3863726

MALICIOUS

PDF

89.0 KB Created: 2021-07-16 08:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)

MD5: a15223a36f1a0d772102a5b968850768 SHA-1: 5bd466b701936b8b23074edcc877452a65382964 SHA-256: a76039e2c38637263633601ea2ded48762f3785da4efe1f9074f88887a74c5d9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to phishing pages or download further malware. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9850

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://ketchas.ru/uplcv?utm_term=apk+editor+android
- https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/no0mbhu497t5bgc4esim0lq2k3/dosokoje.pdf
- https://lensprovn.com/ckfinder/userfiles/files/38396332465.pdf
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946a62736f6---27253307361.pdf
- https://ajur.rest/uploads/userfiles/file/97999288678.pdf
- https://bakotech.at/uploads/ckeditor/files/21814672736.pdf
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c4l83148f9hl1mep71isaablj/zatekebugadafag.pdf
- https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/2r8aoa878d00hrkbgm17n7vosg/57786679410.pdf
- https://keralatemples.info/ckfinder/userfiles/files/seveweritudot.pdf
- http://www.aqsclimited.com/EditorImages/file/27574252881.pdf
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31684387cc---96900755750.pdf
- http://sosonomo.com/ckfinder/userfiles/files/ruxivu.pdf
- http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/savunijubagulumuki.pdf
- https://gamasteel.net/userfiles/file/14643938443.pdf
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f995060676---81975225387.pdf
- https://doellefjelde-mussemarked.dk/images/newsmail/file/xisederodakapefuxalage.pdf
- http://ahkjt.com/upfile/file/rekiripamananikilapigup.pdf
- http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/80588179943.pdf
- https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/4d99acf84c8ab8bf7632cc2c96897de5/mufizorekaseka.pdf
- http://vtvxm.vn/userfiles/file/tasopipupo.pdf
- http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/91562054790.pdf
- https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f1ce8af9784a27f005667b6f25a0a258/zojunejanegewab.pdf
- http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa9fee11d0---jukezutemat.pdf
- http://amsaneeraus.fi/userfiles/files/98710182275.pdf
- https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/77a7a5c8cf7349fcfc6d2c80127201fa/nelexonotix.pdf
- http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089969f5d199---59349594586.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d5a2.bin` `13a65d1871da1fc4ef4bc09e155cb47abc056eb39d27325a2a6b1227e73b4816`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5A2	16456 bytes
`font_01_sfnt_off00010014.bin` `c8188713e81f5dcca25dd858bed5f99b5cfcfa4c052fcdfadf48a7c2bf7e12d4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10014	16680 bytes
`font_02_sfnt_off000117e7.bin` `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117E7	16792 bytes
`font_03_sfnt_off00012ff4.bin` `3f9a5f968d857d5c3eff12522530ae3695909cf2ad561f5641c41b1faac8ee6e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FF4	3088 bytes
`font_04_sfnt_off00013ccf.bin` `3effb85d8bc13c7d79f63982a84fb109130de05cc704a1bbf8d0ea04bcb4f7df`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13CCF	10244 bytes

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