PDF malware analysis — malicious · 9db48b446354a046

MALICIOUS

PDF

67.1 KB Created: 2021-09-25 02:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 3f2d19b2300d230551203d82d2e555a1 SHA-1: 4931c2759897dac0012bb25f983e28e5522e9ae4 SHA-256: 9db48b446354a04628d32d12808853deb922e2754e301c4df7946b8c6d3d547e

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to potentially compromised WordPress upload directories or disposable hosting. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.5315

Heuristics 5

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
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://ranfeng.com/userfiles/file/2021-9///2021911151433895.pdf In PDF document text
- http://baikalspring.ru/ckfinder/userfiles/files/31934570143.pdfIn PDF document text
- https://www.aukuras.org/ckfinder/userfiles/files/66400991886.pdfIn PDF document text
- https://z87992961.com/upload/files/20210902130412.pdfIn PDF document text
- https://observatoire-omic.org/documents/file/29975787926.pdfIn PDF document text
- http://petgears.com/app/webroot/files/file/zomupabipulidoxod.pdfIn PDF document text
- https://songhong-thudo.com/img/files/rubemiwenatas.pdfIn PDF document text
- http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/94834571950.pdfIn PDF document text
- https://makojudo.pl/zdjecia/fck/file/35765872307.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a92fbbade2---38341508584.pdfIn PDF document text
- http://j1ent.com/userfiles/file/20210914084948.pdfIn PDF document text
- http://longtra.vn/userfiles/file/45565032024.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ed0e7b567357dfdf554f7a2d6a685825/xoruvelikature.pdfIn PDF document text
- http://hydrogears.com/survey/userfiles/files/1286041735.pdfIn PDF document text
- http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b309449c3d---liwamaru.pdfIn PDF document text
- http://www.pattyn360.com/upload/forum/files/tupin.pdfIn PDF document text
- https://unaizahic.com/Files/files/likunodedadamajavelelol.pdfIn PDF document text
- https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/54036b6cd67e6ecd806799e185f417cb/20726767601.pdfIn PDF document text
- http://baloneacessorios.com/_upload/file///niganukugorujusovatadidax.pdfIn PDF document text
- http://qianlong99.org/ckfinder/userfiles/files/62411458414.pdfIn PDF document text
- https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/bc8ea40cca64e700b261363c6532d9b9/40634784134.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=my+hero+academia+episode+2+dubPDF link annotation
- https://www.thc.gda.pl/ckfinder/userfiles/files/dexelo.pdfIn 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_off0000b426.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB426	11000 bytes
SHA-256: `08b2446bab523af2d6b62bfd5ee6a2d8595d0b1c6d23e3330a373eaa36ca559a`
`font_01_sfnt_off0000cd8e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD8E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e5a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5A0	17108 bytes
SHA-256: `fc3192cd9337fd7457ad4e79bf1a428a78ba59ed6aedc821cce281f54c20075d`

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