PDF malware analysis — malicious · e08b44a146fa062d

MALICIOUS

PDF

90.7 KB Created: 2021-09-13 16:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 65308046730c9a77abb3b83c715dac37 SHA-1: 400ad9c623bf776a799143d6221226137d7648d9 SHA-256: e08b44a146fa062d62dccc50b6259098aefe294bebc2b50c2439bd4cbeccdec5

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by an ML classifier and contains numerous links to external websites, many of which appear to be disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a potential SEO manipulation or phishing scheme. While no scripts were extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9806

Heuristics 5

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://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sebujobemematidewanetoxe.pdf In PDF document text
- https://skyzoan.com/cake/beta/userfiles/file/zomujusexatepafinuwokepo.pdfIn PDF document text
- http://zhfangyuan.com/uploadfiles/files/bubisufaxasajawapora.pdfIn PDF document text
- https://mrdak.cc/uploadfile/files/pozarunufizababilat.pdfIn PDF document text
- https://tumujerrusa.com/userfiles/30055125452.pdfIn PDF document text
- https://stop-remont.ru/ckfinder/userfiles/files/19027600337.pdfIn PDF document text
- https://xn--b8qxb801j.tw/upload/files/51728322692.pdfIn PDF document text
- https://tanthueviet.vn/img_data/files/1063025469.pdfIn PDF document text
- https://papiratisk.cz/soubory/dutigaxoxoz.pdfIn PDF document text
- https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/300ba5c28f3e383469cdf6f279d97eab/55054568437.pdfIn PDF document text
- http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4f15b862---fizoziwuvakigukotepomutiv.pdfIn PDF document text
- https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4vsmtc6gsa9fjsobbi73ier863/27707709153.pdfIn PDF document text
- http://szintai.hu/ckfinder/userfiles/files/dunomoselozuvu.pdfIn PDF document text
- http://rintoyo.com/userfiles/file/dagugevofasinudolukizu.pdfIn PDF document text
- https://angem.fr/userfiles/file/51458705580.pdfIn PDF document text
- http://kondicionery-himki.ru/upload_picture/file/31992188800.pdfIn PDF document text
- http://exhibitionchannel.com/upload/38367493726.pdfIn PDF document text
- http://xetaihyundai.net/upload/files/zafovuworiw.pdfIn PDF document text
- http://a2kat.ru/userfiles/file/xowapa.pdfIn PDF document text
- https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/9569489793.pdfIn PDF document text
- https://www.prieur-equipement.com/ckfinder/userfiles/files/fupivatelamitadopasejisu.pdfIn PDF document text
- http://studiosimonepantaleo.it/userfiles/files/53860587116.pdfIn PDF document text
- http://thomas-zigon.de/images/file/1367122963.pdfIn PDF document text
- http://skia22.ru/pic/file/gorakabomizi.pdfIn PDF document text
- http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/95164044750.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134245179d72---motigirewolavipifafomim.pdfIn PDF document text
- https://www.agcontraincendios.es/ckfinder/userfiles/files/jiwozenixozawonedukibeb.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dual+boot+win+10+ubuntuPDF 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_off0000fee0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEE0	18568 bytes
SHA-256: `2bc66d5285e18e4b57be5e2eb119abe24e4e1a43aaefd37346fb348b2da24f84`
`font_01_sfnt_off00012e43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E43	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001465a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1465A	10204 bytes
SHA-256: `0910eb2ea91092cd352dc2d4caaabef9ba9f3e3dc7e61d6fb6a145c5cfba67c4`

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