PDF malware analysis — malicious · 99c6032e26953274

MALICIOUS

PDF

88.9 KB Created: 2021-07-04 18:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 4c1d4c444c9cb568191e021aa78bc367 SHA-1: f830cb4ee5da161161961b7fdaa2e8c65c053cc9 SHA-256: 99c6032e26953274ada2ef5e0530902d65a84dea9fde69eadc84f99bf2305fb1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the nature of the heuristics indicate an attempt to redirect the user to malicious content, likely for further exploitation.

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://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/c9b5f6c8a7ac67dc5d147a7167cda84e/kivak.pdf In PDF document text
- http://freehajjandumrah.com/admin/admin/uploadfiles/file/10958485355.pdfIn PDF document text
- https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e3101544c2f37c407fa18b8250c08933/dogatubiloxaduxugabazaja.pdfIn PDF document text
- https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/566d8c5e47f970a293e71ee7f5555634/57020797866.pdfIn PDF document text
- https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5554610b07---jewoxi.pdfIn PDF document text
- https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/19ddfdb57ddbcd75ab5c98743bf68d6e/83733321177.pdfIn PDF document text
- https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/86345h8mgk9jpsvtrdu7012aic/44426964142.pdfIn PDF document text
- https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/77aaff8092a9a89590e88f73f2d83139/remowebufojoxapogimokitef.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b80379ad2---suremu.pdfIn PDF document text
- https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ps3vejnsjims39mu4gbjpsf5qj/1003890845.pdfIn PDF document text
- http://design-klasse.de/ckfinder/userfiles/files/gopirafar.pdfIn PDF document text
- https://bachson.net/upload/file/tibumu.pdfIn PDF document text
- http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/tafozuzafaluwidovulirodi.pdfIn PDF document text
- http://arohitourandtravels.com/userfiles/file/8112225529.pdfIn PDF document text
- http://bocghedanang.com/media/ftp/file/91935390002.pdfIn PDF document text
- https://deltagroup.bg/uploads/file/77384287279.pdfIn PDF document text
- https://area5srl.itfile/dugadixojofexuwadajed.pdfIn PDF document text
- http://humanlitech.com/files/files/rilegawoxirebexonuro.pdfIn PDF document text
- http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc8c0bdc2b---74787838855.pdfIn PDF document text
- https://arerp.kr/data/file///kaxoputiw.pdfIn PDF document text
- http://www.odnpoznan.pl/fotki/file/file/79791829176.pdfIn PDF document text
- http://jullien38.com/ressource/site-image/files/kijekabujewoxezilug.pdfIn PDF document text
- http://kimhoatra.com/upload/fckimagesfile/goxuwutajemuvufixinuzogi.pdfIn PDF document text
- https://karapinarinsaat.net/userfiles/upload/file/bifidedevezibipabikoxedom.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=why+is+prime+factorization+importantPDF 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_off0000f843.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF843	17168 bytes
SHA-256: `e8dfcdf568dbc1da185ca89071b043146849c15c548cdaab68d18defd0c9f8fb`
`font_01_sfnt_off0001253d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1253D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013d54.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D54	10868 bytes
SHA-256: `16a3190349d1aaa2d2bf0ceaba9d00dce1efe8a56468f035face2f26317619d1`

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