PDF malware analysis — malicious · b8b1e6487f04e0ae

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 09:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: f21b354888a7940a4c8e03255b887b25 SHA-1: 6ac00bff28c6051948741f687c8d241b8a535402 SHA-256: b8b1e6487f04e0ae1f2b66cb5f431710e770f977f1f12e4c16796f1aaa54c942

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified by ClamAV as Pdf.Phishing.Trojan. Heuristic analysis indicates it functions as a link farm, with several URLs pointing to compromised WordPress upload storage. The ML classifier also flagged the PDF as malicious with high confidence. The primary attack pattern involves luring users to potentially malicious sites via embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://derey.nl/app/webroot/files/userfiles/files/22268482127.pdf In PDF document text
- https://balajihighfields.in/userfiles/file/4316584928.pdfIn PDF document text
- http://jrmhandling.nl/upload/file/zisobozi.pdfIn PDF document text
- https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/49dad0cf794fbabe98a0b6c46f9cfe95/831635581.pdfIn PDF document text
- https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c61211c064---jimefizexolunesu.pdfIn PDF document text
- https://datatech-int.com/userfiles/file/sewogipur.pdfIn PDF document text
- https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/efd223620d340237e8516cccab98dfce/9277538584.pdfIn PDF document text
- https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9f1f2cd40d0994261a067436536a92b/76565950432.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/e1a3d1191ae4t6n5tv2o772l01/jeligovedekirelosag.pdfIn PDF document text
- https://www.jnvhardoi.org/ckfinder/userfiles/files/sifotezaki.pdfIn PDF document text
- http://antansconstructions.com/ckfinder/userfiles/files/jonijejozis.pdfIn PDF document text
- https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a35892dfaa---babidabikugarowogemuxig.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3a4330beae97f41fa2e2ba74e65de68e/lojugulijewif.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e21e7dfa9b---lafurijasugonigeko.pdfIn PDF document text
- http://maroba-zirndorf.de/file/mulixokosokuju.pdfIn PDF document text
- https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/30400334775.pdfIn PDF document text
- https://weyergans-hcc.lv/userfiles/file/63688553197.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd995cace2---poligofotu.pdfIn PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078df795b3f7---84661294327.pdfIn PDF document text
- https://selispin.com/calisma2/files/uploads/sokorejunexow.pdfIn PDF document text
- http://pcwenhua.com/uploadimg/file/16276757702028105148.pdfIn PDF document text
- http://xn--franzsischebulldoggen-lec.eu/userfiles/file/79759486866.pdfIn PDF document text
- http://ptairsupply.com/userfiles/file/xamam.pdfIn PDF document text
- http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091129a63d22---pipokivulidebubevutome.pdfIn PDF document text
- https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/6d9e902d8f18e8b6b7ad9796ba661b5a/kejuwoxozipefixalijilozu.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee644ed4064---31872794003.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=guia+homeopatia+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_off0000d8eb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8EB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f0fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0FD	16936 bytes
SHA-256: `9693a237b8aed31fbc19fc07156aff571599e32e3e42493d1bb92444b061f0b5`
`font_02_sfnt_off00011c07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C07	10484 bytes
SHA-256: `8352c5f33619fb563e9e99b84d453ab766b327963cb1898ae021f2b9d6087676`

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