PDF malware analysis — malicious · 906fbc1a499ef996

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 20:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 9b44a0949cf4e25894e05a0d929bb028 SHA-1: 5d0efbfdb54651484571bc48dea0a5a7bc590e5c SHA-256: 906fbc1a499ef996ca0b895d5ed10856843a98bed801b3434d61648c6598de03

132 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to compromised CMS uploads and disposable hosting, indicating an attempt to obscure the final destination and evade detection. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a lure for phishing or to download further payloads.

Machine Learning

Nyx PDF Classifier suspicious score 0.3798

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://dominoliberec.eu/images/file/files/79715607380.pdf In PDF document text
- http://tbff-bygg.se/img/files/52012689427.pdfIn PDF document text
- http://bargiel.com.pl/ckfinder/userfiles/files/junem.pdfIn PDF document text
- http://sklepjola.pl/userfiles/file/25635910841.pdfIn PDF document text
- http://targhevaticane.it/userfiles/files/buwabewurudukizenujubili.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efcc0125bd---15376238471.pdfIn PDF document text
- https://www.prshots.com/ckfinder/userfiles/files/38176941056.pdfIn PDF document text
- https://eko-briketes.lv/userfiles/files/muzokebifovorumedofagewum.pdfIn PDF document text
- http://utuin.net/files/fckeditor/file/gogoguwasu.pdfIn PDF document text
- https://tunhuaduytan.com/upload/userfiles/files/23971274503.pdfIn PDF document text
- https://urbanlivin.lu/userfiles/files/jewetosijesopabalesi.pdfIn PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a4919776807bff6087dd1e4d04534f33/luxeziwukidogiwuwofixaju.pdfIn PDF document text
- http://maydemtienvn.com/upload/files/xudutixogum.pdfIn PDF document text
- https://lawina-radom.pl/files/file/ziwozol.pdfIn PDF document text
- http://cardealer-space.com/js/upload/files/1526029120.pdfIn PDF document text
- https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614192e4a0350---labifejefuvepibi.pdfIn PDF document text
- https://toskov-yordanov.com/userfiles/file/timigefawegogeteja.pdfIn PDF document text
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/sfdr5ee195nmoeoi373msq90n6/pepovikobadiwaziguni.pdfIn PDF document text
- https://drhuanghair.com/uploads/files/202109071533021986.pdfIn PDF document text
- https://kidneystonetreatment.in/userfiles/files/92048638816.pdfIn PDF document text
- https://www.fangjin.org/ckfinder/userfiles/files/ponenavisupewezit.pdfIn PDF document text
- http://primethailand.com/ckfinder/userfiles/files/xezibakoragagus.pdfIn PDF document text
- http://miyagi.chi-kara.net/Upload/files/wuguru.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132b5b046c3b---debelejonigomikegodeme.pdfIn PDF document text
- https://hse.tw/upload/file/fosalesege.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+fire+diamond+download+appPDF link annotation
- 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_off0000e44e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE44E	10456 bytes
SHA-256: `61b8142e1167adccd8b68e28265a6a50c56de7b68a63f2bdf9771f8654a6e414`
`font_01_sfnt_off0000fbf4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBF4	18184 bytes
SHA-256: `c2d0a76b3592ec91f657d5508ce34b67c843753bff00b18582397757a3ae8e99`
`font_02_sfnt_off00012b1c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B1C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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