PDF malware analysis — malicious · 5239a664495cafe2

MALICIOUS

PDF

86.8 KB Created: 2021-07-05 19:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 59f8249ef3e13ab981fba17f69a6e396 SHA-1: c3905fae6370dc861899927b5fa97ed2ed4b9a5e SHA-256: 5239a664495cafe2ea8b951b724ca58e2ba4e839dd882e94089b06a6064989f9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=bonaok+microphone+instructions PDF link annotation
- http://kondicionery-vidnoe.ru/upload_picture/file/tufuso.pdfIn PDF document text
- https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/33e1ba289ac460e0e2f2e676da791def/fidavulenu.pdfIn PDF document text
- https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac7b918247---lewepepudegoneminepuvutu.pdfIn PDF document text
- https://purefeeling8.com/data/file/wirosenofaxo.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072fde62c802---20831072242.pdfIn PDF document text
- http://kondicionery-fryazino.ru/upload_picture/file/4440219263.pdfIn PDF document text
- http://rolmech-strzelno.pl/Upload/file/teberu.pdfIn PDF document text
- http://chi-kara.net/userfiles/file/jenivanikaxibunijusisaxe.pdfIn PDF document text
- https://gregor-biffiger.ch/userfiles/file/dofidileso.pdfIn PDF document text
- https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/id45sd1j332d0e35ku2ldjjj01/31743626245.pdfIn PDF document text
- https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/uu7c95hsn0dian33hvcrdcj3lp/69559672343.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/868a9f68e885ed1eca497875d5604c18/pilubanikuxidijevilul.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860dc9605f5---83768698705.pdfIn PDF document text
- https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a99b87abf---17991812246.pdfIn PDF document text
- http://nessium.fr/userfiles/file/jamenapibo.pdfIn PDF document text
- https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/1508dd985be47f186843e75ba0764f7b/71925915114.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be27003b7b8---74186799669.pdfIn PDF document text
- https://searchlink.org/userfiles//file/4500400454.pdfIn PDF document text
- https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nnejegkie07fid3i1j02vq1gn1/44284684082.pdfIn PDF document text
- https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609f6162bd2a7---kipobadaboxizepo.pdfIn PDF document text
- http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993947a8855---jabatuzimuwugatolilafim.pdfIn PDF document text
- http://spreewaldatelier.de/img/editor/file/vularetofexez.pdfIn PDF document text
- http://tokstar.com/_UploadFile/Images/file/82802373542.pdfIn PDF document text
- http://huntland.hu/upload/file/36217226880.pdfIn PDF document text
- http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9rir0pjqej7ad2lhl6b55mn6l1/bexosasiwixolubuxulak.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_off0000e9ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9AD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000101bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101BF	19548 bytes
SHA-256: `b3d6c500bb57e2c0046e4588a378c3156bc531dd5836fa0485328f323f24622c`
`font_02_sfnt_off000134f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134F1	10836 bytes
SHA-256: `42efd1986794d34aaaccd58bd19441dd4aa5df8af8756151343b7b15e2a9fbae`

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