PDF malware analysis — malicious · 93dfa065088e8767

MALICIOUS

PDF

106.5 KB Created: 2021-06-29 09:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: e810e6b76dae41a32a9cea7de8fe971f SHA-1: 4b0a361a6e28f41d27158821e84522948b5472f9 SHA-256: 93dfa065088e876729d5a6aeb6e2092f365d0db79fcf8f0bb7a8e555cc858b52

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware hosting sites. The presence of external URIs and the nature of the links indicate a likely spearphishing attachment used to distribute malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9881

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://crewmak.ru/uplcv?utm_term=vowel+and+consonant PDF link annotation
- http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ab9b362e0dabc55c7b9f97ae916b4f88/talupoluwopigafapuwur.pdfIn PDF document text
- https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9cc6204300c0a8da9aa79a39ffec780c/kegememilo.pdfIn PDF document text
- http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9d680d27---pizejub.pdfIn PDF document text
- http://loveperfectionschool.com/upload/file/varowulojikenomiv.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/r8vd1f5b89s8mj9cng73bot335/ligefopifemax.pdfIn PDF document text
- http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609225974dd69---27220920228.pdfIn PDF document text
- https://ferado.vn/userfiles/file/tifunu.pdfIn PDF document text
- http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/hq6i4qi5fi2ke57mhsh5fq0rj5/bazisidimototok.pdfIn PDF document text
- http://curry-box-deluxe.de/userfiles/file/lorubixezeladojuluxeli.pdfIn PDF document text
- https://anfauglir.com/images/file/wikefejuvikikugavi.pdfIn PDF document text
- https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/af13c501d60d8e90aa8e11712fd278de/tudasos.pdfIn PDF document text
- http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608323d5ee322---31776177809.pdfIn PDF document text
- http://kup-vino.cz/web/ckfinder/userfiles/files/fubunimapilokolomem.pdfIn PDF document text
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afb72186d81---79662622584.pdfIn PDF document text
- http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef63c8da88---7681174215.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/suximoxu.pdfIn PDF document text
- http://nagymester.com/userfiles/file/zomamukujojagox.pdfIn PDF document text
- https://businesslife.com/content/files/27549488432.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f914d6b3a3---5898059066.pdfIn PDF document text
- https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/b51afb256a28d24a4ba9e09b4a3fb123/2028612112.pdfIn PDF document text
- http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608abeef69c50---tuzujujokubanitader.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a80e7966bb0f5beaf9206cd26c02a082/43030662476.pdfIn PDF document text
- http://sriagasthiyarastro.com/FCKeditor/userfiles/file/sebofutujupum.pdfIn PDF document text
- https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b9ee52d19---mijenukijefebitanenuligex.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ffbf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFBF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000117d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117D0	16072 bytes
SHA-256: `43523becfbefc0ddb4744758b55a028bdbbad0d5a67cdb8d77c436db9c152cd5`
`font_02_sfnt_off00012ceb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CEB	10224 bytes
SHA-256: `ae138749e6349cbfed7b21b0e5a472270d960da99f298ae7fe9081ebac1f6012`
`font_03_sfnt_off00014417.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14417	37236 bytes
SHA-256: `18e004f13447c7bd0a3eb9514c958ac68d39532f33725571e9218b4b55e2361d`

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