PDF malware analysis — malicious · 938cc3f352cbe407

MALICIOUS

PDF

76.0 KB Created: 2021-09-25 00:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03

MD5: e3576cf6e4829bbfca8b24baaf41c943 SHA-1: 7bad473be127e0c8a933e66cd12ba06b01ed8bf6 SHA-256: 938cc3f352cbe4079e080203a036b764f5502cbf3cdc7c72a2dfe41c192660d7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many of which point to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded content indicate it is not intended for legitimate use, but rather as a lure to external malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://digireg.at/upload/57609749083.pdf In PDF document text
- https://demo-calson.garment-pro.com/ckfinder/userfiles/files/xajodu.pdfIn PDF document text
- http://seksdagen.nl/userfiles/file/zunarij.pdfIn PDF document text
- https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c4b79630---remikodotitixedawesi.pdfIn PDF document text
- https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/03a6637864f882cbe59f6d4b55a37233/7249177387.pdfIn PDF document text
- https://araprinter.com/ckfinder/userfiles/files/97284945576.pdfIn PDF document text
- http://zartmobilia.com/userfiles/file/20210909205033.pdfIn PDF document text
- http://studiomanzetti.it/userfiles/files/60152543443.pdfIn PDF document text
- http://richmore.kr/uploadfile/fckeditor/file/gapuruperegepijizujubis.pdfIn PDF document text
- https://www.winsum.frl/ckfinder/userfiles/files/3609537237.pdfIn PDF document text
- https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614548c750973---52517464904.pdfIn PDF document text
- http://aliguoriarchitetto.eu/userfiles/files/76888303008.pdfIn PDF document text
- https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2782edb3---91960314346.pdfIn PDF document text
- http://ewhamd.net/upFiles/ckeditor/files/girinopidebo.pdfIn PDF document text
- http://bienchidan.org/uploads/files/21771342372.pdfIn PDF document text
- https://pirkitpadangas.lt/ckfinder/userfiles/files/nakepigezozimusozajilafuz.pdfIn PDF document text
- https://ctyhoanongangiang.com/userfiles/file/49069188673.pdfIn PDF document text
- http://jdjcnc.com/upfolder/e/files/20210910101219.pdfIn PDF document text
- https://telechips.com/ckfinder/userfiles/files/13807909173.pdfIn PDF document text
- http://ajarnveerapong.com/UserFiles/file/74767195404.pdfIn PDF document text
- http://pro-elec.ru/ckfinder/userfiles/files/71824193210.pdfIn PDF document text
- http://multiflex.ru/userfiles/file/kumofagid.pdfIn PDF document text
- http://aiswaryamatrimonials.com/fck_uploads/file/vavenelovamu.pdfIn PDF document text
- https://cfaegaianascente.pt/portal/userfiles/files/bugedigazotexuvoduvoj.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+change+a+secured+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_off0000c01e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC01E	18704 bytes
SHA-256: `326b4ae630e2386655bd23fdda535d07fffc5d87cf6124770f925c31c398b8e8`
`font_01_sfnt_off0000f0ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0CA	10940 bytes
SHA-256: `336d01966a2982d9e18ba6a7e8b73344ef20e66550398ec16b8852c1b97dad71`
`font_02_sfnt_off000109f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109F1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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