PDF malware analysis — malicious · 55eb9e7b4c95c467

MALICIOUS

PDF

75.4 KB Created: 2021-09-09 16:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 28bb6e6ea3211a289a657444752f27f9 SHA-1: 3037b8250d442a5335e96a50bee62f02db21346a SHA-256: 55eb9e7b4c95c4677d1189974c0fad90b5a5800d8da38580c4e48d68f02eb3b1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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 http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398edc56db1---wufulodi.pdf In PDF document text
- https://atvatextile.com/upload/ckfinder/files/posubefapixafemadunorefu.pdfIn PDF document text
- https://manorhair.com/uploads/files/202109010134066541.pdfIn PDF document text
- http://gazdalkodjokosan.hu/img/userfiles/file/padodawezegunigulav.pdfIn PDF document text
- http://nhatrangpalace.vn/app/webroot/upload/files/buvawijabimaribipax.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363dd19c38d---30527759628.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613572d2c3812---24093124940.pdfIn PDF document text
- https://cian.hr/userfiles/file/mudipezu.pdfIn PDF document text
- https://indicaperu.com/userfiles/file/53128529684.pdfIn PDF document text
- http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/67383393854.pdfIn PDF document text
- http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/fupabujipuzejakasawowetu.pdfIn PDF document text
- http://machin.kr/userData/board/file/66786791821.pdfIn PDF document text
- http://ig-einheitsloks.de/medien/file/81349169627.pdfIn PDF document text
- http://mirsistem.com/depo/sayfaresim/file/sexurafagivibovikugog.pdfIn PDF document text
- https://coopinproject.eu/ckfinder/userfiles/files/jogosamevowi.pdfIn PDF document text
- http://profstil.az/userfiles/file/gusenabukubupijojapob.pdfIn PDF document text
- https://shiokuda2.com/contents/files/mavujimurotutiranaxup.pdfIn PDF document text
- http://bertrandetgastineaudesigners.com/userfiles/file/6107600385.pdfIn PDF document text
- http://zonwering-nederland.com/ckfinder/userfiles/files/76507279298.pdfIn PDF document text
- https://mobilieroccasion.fr/uploads/file/3441380702.pdfIn PDF document text
- http://thesei.com/In PDF document text
- http://daglichtfilters.nl/ckfinder/userfiles/files/80923457498.pdfIn PDF document text
- https://weilaimachinery.com/userfiles/files/25986929453.pdfIn PDF document text
- http://amghanoi.com/images/ckeditor/files/99808890940.pdfIn PDF document text
- https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/st2v0eedd6f2p5r2eclpl74d8c/juwinobiponebivunepu.pdfIn PDF document text
- http://lidaoxc.com/upload/files/41416401314.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=genki+n5+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_off0000c390.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC390	17816 bytes
SHA-256: `008f69a6e3955342de7d6257707e1dfae9e7ddd6dff24685a9bda4e7c8a019d6`
`font_01_sfnt_off0000f1f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1F7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010a0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A0E	10060 bytes
SHA-256: `eadcba1fa1dd85159ab2ed549978ade1d3d2989fbfd2af8c4e86fc990df187b4`

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