PDF malware analysis — malicious · 7c9008dd08df5243

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 04:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 486e0566527f594193e5146d649d1f60 SHA-1: c8355f0c48981581f8d0ee61c512eaec52ac57cd SHA-256: 7c9008dd08df52438b0198cb1b83733dbca017a42aa321cbe421c5f29e73debf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://irlanc.ru/uplcv?utm_term=najbolje+android+aplikacije PDF link annotation
- https://mi-stores.com/basketballtotaal/images/editor/file/32862211389.pdfIn PDF document text
- https://wcfkenzi.com/ckfinder/userfiles/files/48074298326.pdfIn PDF document text
- http://majstrissmt.eu/www-data/file/rojufevipuwawagepo.pdfIn PDF document text
- http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ah0d95oeleeobva2k1fusbb6uh/kiwida.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131456f9904d---loguvor.pdfIn PDF document text
- http://biomax.shop/filespath/files/20210908082004.pdfIn PDF document text
- http://trungtinjsc.vn/upload/FCK/file/pitudirefokorajudi.pdfIn PDF document text
- http://agapetown.net/ckfinder/userfiles/files/dimar.pdfIn PDF document text
- https://agronlogistics.com/userfiles/files/foxoguguxegom.pdfIn PDF document text
- https://0924055971.com/uploads/files/202109050542072697.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130827b75df6---88417376828.pdfIn PDF document text
- http://poaglasses.com/uploads/files/202109020100449215.pdfIn PDF document text
- https://valgott.com/images/userfiles/file/futetesud.pdfIn PDF document text
- https://comobrew.com/newsite/images/user_uploads/file/mexevaju.pdfIn PDF document text
- http://www.macrolepidoptera.hu/userfiles/files/savid.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161339e1160654---pogofiweg.pdfIn PDF document text
- https://soccerauquebec.com/userfiles/file/devusa.pdfIn PDF document text
- https://stalbeckers.nl/userfiles/image/file/femiboxetefekino.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6bb433815d6bfc8c30e13a8a2530372c/tisimupatigavake.pdfIn PDF document text
- http://hflbdq.com/uploads/file/051803181799.pdfIn PDF document text
- http://gnox.vn/upload/files/gexuwomupuw.pdfIn PDF document text
- http://studio70.eu/userfiles/files/mitapijoperovod.pdfIn PDF document text
- http://wxbeimei.cn/upload/ckimg/files/202109060724396190.pdfIn PDF document text
- https://bisleriuber.genefied.co/ckfinder/userfiles/files/55893190010.pdfIn PDF document text
- http://roomyab.ir/basefile/roomyabir/files/50177915207.pdfIn PDF document text
- https://alternatifhirdavat.com/upload/ckfinder/files/tifejatofuze.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_off0000e0c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0C1	10580 bytes
SHA-256: `6cf0287870de4eaa4e241eee4583e3e98d4e144d233811d5a1729123b5082dd6`
`font_01_sfnt_off0000f8b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8B5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000110c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110C7	16336 bytes
SHA-256: `cc3417d3b3f702b954003dbcf524f4ad362a03fd6eb06c053c5bf07ea462064d`

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