PDF malware analysis — malicious · 4618b0cf12dfa96e

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 01:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 9466bf3609c0aa63d1b6d2f5f395a6e4 SHA-1: 2ac6360c6d6d62e586f16d1db6a595dad0a32ef4 SHA-256: 4618b0cf12dfa96eabeb082519966908334efebf1d913c60e77bef92cdfc910d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing malicious content through external URLs. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://synerhu.ru/uplcv?utm_term=broland+map+download PDF link annotation
- http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/27903477500.pdfIn PDF document text
- http://aklond.com/UploadFilesfile///2021060309465961.pdfIn PDF document text
- https://namhunglogistic.vn/site/files/vupamoz.pdfIn PDF document text
- https://bangprice.com/bangprice.com/beta/cms_image/file/36852898466.pdfIn PDF document text
- https://fullhousetourism.com/UploadFiles/file/20210524031506137.pdfIn PDF document text
- https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/aar05dl0ul8duugdss7ri937p1/86853348197.pdfIn PDF document text
- http://architettoseneca.com/userfiles/files/zuwajimubimig.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160781a7d893a8---84485632773.pdfIn PDF document text
- http://flexa.cz/docs/file/karepig.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a6288572---79266568552.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b07b16ed0c2a9e14818da1a63043d2ec/95928329328.pdfIn PDF document text
- https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/9badebb0204c6ab4ae7e692389a486e4/10621024230.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3c5c55ec490d07e28299f7e9c8740fb4/tenevabimopumexuzilu.pdfIn PDF document text
- https://perfecthospitals.org/FCKeditor/file/36786169798.pdfIn PDF document text
- https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/f4ti0frkofqbbul98posqjru7g/22772633668.pdfIn PDF document text
- https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/0auncp9p2kn0uq3r787gj0it9b/19229520115.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f4686a91ef503ca89f5342f4e1c4ba43/59852043936.pdfIn PDF document text
- https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a66815332714a73210ddd24e048762b7/6898027325.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972ce70a01a---6327675010.pdfIn PDF document text
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160770fbb10803---batuninepukogabaz.pdfIn PDF document text
- http://dgjst.com/upfile/file/4443082747.pdfIn PDF document text
- http://bjhtdszdh.com/v15/Upload/file/2021531543225702.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/h0tds3lesa9bom31213e64ppr6/damupepemegotegivi.pdfIn PDF document text
- https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/6c0e1ef090ba8fd4511431cfe2b6f54c/webolisuwofovuleputod.pdfIn PDF document text
- http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b85fb19d28f---61028011270.pdfIn PDF document text
- https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/17c1be3a1463456e07488c1df6723bc0/85002358862.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_off0000ea20.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA20	10204 bytes
SHA-256: `5cd11c68ea23a4eb6a9bbdbe237426e8d65d41e345308384b24fb391d6eaa4a7`
`font_01_sfnt_off000100f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100F1	16728 bytes
SHA-256: `999ebdfabac621bfdfa9b8296854aa794c396bf19b215a2a0b775f2ace27c982`
`font_02_sfnt_off00012c45.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C45	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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