PDF malware analysis — malicious · 6c3b2becf3f74007

MALICIOUS

PDF

88.6 KB Created: 2021-09-03 09:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 74345d9b1b2fbe1c5f5398c75e36885d SHA-1: fad35c68757c972d461c09bd572c306a82a3f71e SHA-256: 6c3b2becf3f740073fde915c13ad730a702872153b5eeb3fd49e279acb67593d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs, such as http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/772058d42386d61dd926e812a74844a8/31548057219.pdf, are likely part of a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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 http://studio5r.com/userfiles/files/nulurokuremu.pdf In PDF document text
- https://brawlcall.com/ckfinder/userfiles/files/16245656923.pdfIn PDF document text
- http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/20497630571.pdfIn PDF document text
- http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717ae88ca60---13081633267.pdfIn PDF document text
- http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161167cfa449df---kukinurejimozipebivam.pdfIn PDF document text
- https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/be080658998357fbea21d6a16e0b9f04/27716087447.pdfIn PDF document text
- http://sattamatkapatti.com/userfiles/file/rujiwirosek.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ec6fc8ab9---29587598166.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7bf8d5748a3b7b6bfd43d38c3de8ac01/51747419562.pdfIn PDF document text
- http://teleserviciomalaga.com/ckfinder/userfiles/files/10300994660.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a29befaf---77421250779.pdfIn PDF document text
- https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/b5b410be545fb393c7f30c3eafcd512b/3009043072.pdfIn PDF document text
- http://pinzimoniofiumicino.eu/userfiles/files/gawiwavugel.pdfIn PDF document text
- http://copy2d.com/ftp/image/file/85492583782.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e412f88f2e3---fuxudunoxozipitifowebi.pdfIn PDF document text
- http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/772058d42386d61dd926e812a74844a8/31548057219.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eogqvplrukmnr5qnc6cj5q1867/vijarexawubutufigejigorum.pdfIn PDF document text
- https://europartner2.pl/uploads/vidaxezonebedenabax.pdfIn PDF document text
- http://orkoien.com/userfiles/files/gopoxefamugikelifelawox.pdfIn PDF document text
- http://redeyeldn.com/userfiles/file/xogivaranorufebamubufal.pdfIn PDF document text
- http://nsdadventist.org/FCKData/file/nituzofawejanetat.pdfIn PDF document text
- http://hengtongrongshang.com/jingkelun/userfiles/files/20210820033116.pdfIn PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/26efa5310ecae12719c56cda939486b8/miritupozudam.pdfIn PDF document text
- https://akproauto.com/nbloom/fckuploads/file/josezu.pdfIn PDF document text
- https://xanbiente.de/userfiles/file/sufuj.pdfIn PDF document text
- http://amirafouad.com/uploaded_files/file/tunedikewovaditekanubow.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=computer+graphics+books+pdfPDF 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_off0000f434.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF434	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010c4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C4B	11280 bytes
SHA-256: `3a42ea1a81ccaa8e491cfd45f0458b868a08056415e92203180638ecd133953b`
`font_02_sfnt_off00012668.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12668	17720 bytes
SHA-256: `01b2d164a774ff50d5bd9e508cef487d45c6304e8cc0ecffca35169613ec68c1`

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