PDF malware analysis — malicious · 81cd93ddd45ce5fc

MALICIOUS

PDF

86.7 KB Created: 2021-06-25 20:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: d756388e787873467f65b7700d1969e0 SHA-1: 3338613f1db49867f6e0528817a32496d25df868 SHA-256: 81cd93ddd45ce5fc0742506698f5abab6a41d3f973de08c4028a093bbbfde0fc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, which is often used to create malicious PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://chcial.ru/uplcv?utm_term=infected+hair+follicle+armpit PDF link annotation
- https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/a43b567a28c2e6857ec100d04d1db493/geluwapapugumufo.pdfIn PDF document text
- https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/977651b21ee732d21030416f64f67761/xegonel.pdfIn PDF document text
- http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3f9bad291---64257367241.pdfIn PDF document text
- https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a48be86a3---12763997465.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607439fe3b1b2---84282541196.pdfIn PDF document text
- https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3069bd0f---4231158881.pdfIn PDF document text
- https://ckd-otto.com/contents//files/31804830828.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/bizifaruxadukazu.pdfIn PDF document text
- http://fatamorgana.fr/uploads/assets/file/1060083110.pdfIn PDF document text
- https://audreyheselmans.com/_files/file/ribaladivokozozagag.pdfIn PDF document text
- https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2fafaead15fe1393aa247acc0b70e1bc/filakelosebisevajasep.pdfIn PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ba044db84---tupisar.pdfIn PDF document text
- http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077f2e061582---93149760124.pdfIn PDF document text
- http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/38h9qftamvv8d0l32ri9l12ki7/79750875661.pdfIn PDF document text
- http://byty-pardubice.eu/UserFiles/File/putipekudaz.pdfIn PDF document text
- https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/k05a8f7b8peqpd5o7t09l4dlg3/tegerixurizudanorawota.pdfIn PDF document text
- https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085b4f3d12b0---fitototu.pdfIn PDF document text
- http://zoncmswebsitebeheer.nl/files/editor/file/kexuditab.pdfIn PDF document text
- https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab491e76cc---52277591196.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/akhp7kqstv5l7q8o1ot2i1s31n/97462639419.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608e951eed3bd---3389365864.pdfIn PDF document text
- https://anthonygillant.com/userfiles/file/wirexavawena.pdfIn PDF document text
- http://ttmplus.com/userfiles/files/36479697972.pdfIn PDF document text
- http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2m6j8fkf1jae6h1er4n6grmul4/95414192599.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/95ba021e1aa1808f03f90690f1307348/kakituw.pdfIn PDF document text
- https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bd7c825a6---39349898692.pdfIn PDF document text
- http://a-swiss.com/upload/userfiles/file/38632968354.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_off0000f16f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF16F	16828 bytes
SHA-256: `ec1aadf689179152925a0e8096c24a79628ced204c07de30c1b2fa1a480b8543`
`font_01_sfnt_off00011d41.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D41	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013558.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13558	10668 bytes
SHA-256: `44a2da4895685638a4bd8a022c82a6bfa1b0b20b44920892b11878d3803a3cc3`

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