PDF malware analysis — malicious · 975ae07fe68125df

MALICIOUS

PDF

76.0 KB Created: 2021-09-08 20:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: fbf61f85e482263a85ebbe17faac046f SHA-1: 372b7105ac15e51b2f01864252fbfa7a0802fb87 SHA-256: 975ae07fe68125df62f98e5192069c55607747ea86a5eabd392b95622d00eae5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of links, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the overall structure strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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.
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://potlista.com/file/files/13325787275.pdf In PDF document text
- http://robertfeinberglaw.com/images/edit_images/file/bepowikanafijobube.pdfIn PDF document text
- http://aa-nusd.jp/17529511370.pdfIn PDF document text
- http://northmarking.com/userfiles/files/dolerekawujebawivofape.pdfIn PDF document text
- http://idealthailand.com/file_media/file_image/file/39256321064.pdfIn PDF document text
- http://022-web.cn/uploadfile/file/20210903004742490.pdfIn PDF document text
- https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaced521a9---xadup.pdfIn PDF document text
- http://optykglowacki.pl/obrazki/files/30159770449.pdfIn PDF document text
- https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/a6qb3lhl4k1808m9l9magnuh43/ziwitukifowebunuwele.pdfIn PDF document text
- https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1e48b7f0---86991787728.pdfIn PDF document text
- https://vinacomvietnam.vn/uploads/news_file/66673173371.pdfIn PDF document text
- http://tuzoltosagmihald.hu/userfiles/file/fusokunowuxenojekipur.pdfIn PDF document text
- http://bjerkelunden.org/content/files/userfiles/file///567409104.pdfIn PDF document text
- http://divapharma.com/uploaded/file/37200560699.pdfIn PDF document text
- https://aldaserwis.pl/ckfinder/userfiles/files/xepozavijone.pdfIn PDF document text
- https://edu-mate.kr/_UploadFile/Images/file/fegemikudab.pdfIn PDF document text
- https://arab-hams.com/Ups/files/63051921801.pdfIn PDF document text
- http://metafelix.it/userfiles/files/44910345840.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+to+word+converter+free+online+no+emailPDF 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_off0000c44b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC44B	17688 bytes
SHA-256: `36d3c56dbe4fb086d5d12856f2e430d9003d7305de37f3737eb793e344e4383b`
`font_01_sfnt_off0000f24e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF24E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010a65.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A65	10620 bytes
SHA-256: `6af4160ed1c42bd785e311222bed57ca2fdf83743a0975f7ff7340c042fd09bf`

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