PDF malware analysis — malicious · 388aa1c9ae967e75

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 00:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 757854bb6a24c14330bdc888d2dd8e38 SHA-1: 54ddcc5ccbe8719c43ea2d2f25f3e43184b81322 SHA-256: 388aa1c9ae967e75b2602d1bc68ef207eeef941f0b2c74cfc077c4fbdd152cc4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised WordPress sites. While no scripts were explicitly extracted, the nature of the links suggests an attempt to lure users to malicious or deceptive content, aligning with phishing or SEO abuse tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afe0a7e4b30---4142071893.pdf In PDF document text
- http://giustizianuova.it/userfiles/file/sivisapopenuvubevepet.pdfIn PDF document text
- http://otohondamientay.com/upload/files/galazur.pdfIn PDF document text
- https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/mtubb1tp1usmrg7bj5dtubnkfj/33268492472.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e45eac438f---2486445951.pdfIn PDF document text
- http://www.buildingmalawi.com/images/uploaded/documents/wuzovutoxonenip.pdfIn PDF document text
- http://www.tamtrebinhminh.com/public/files/30239041398.pdfIn PDF document text
- https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8vajjjdqg8cqebhjk5h0477qeb/simijavivires.pdfIn PDF document text
- https://bak.vn/upload/files/80819091554.pdfIn PDF document text
- https://1877painters.com/FCKeditor/file/4871154826.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af3f4a4d8d5---bagefujivabupudobo.pdfIn PDF document text
- http://fszhenjia.com/upfolder/e/files/20210531000854.pdfIn PDF document text
- http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612bc077f0ecf---sirupumiwesaguvuluxa.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df75b7e101---kurevomurari.pdfIn PDF document text
- https://robert-zauer.cz/userfiles/file/89917749475.pdfIn PDF document text
- http://asfalon.com/__files/file/wonumafo.pdfIn PDF document text
- https://coastalstudio.com/images/main/file/nibagakome.pdfIn PDF document text
- http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/61604177556.pdfIn PDF document text
- http://czyxchem.com/upload/files/46618216814.pdfIn PDF document text
- https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/66a4d0dffc7a16f1b6a0647e09822052/zaxuwakagalapumivewiwe.pdfIn PDF document text
- https://pellevah.com/upload/files/61430155825.pdfIn PDF document text
- http://montaze.org/democms/userfiles/file/753883292.pdfIn PDF document text
- https://activepymes.com/pub/file/fibev.pdfIn PDF document text
- https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1418a7c57---36711628039.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=grade+1+phonics+test+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_off0000cca0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCA0	18200 bytes
SHA-256: `ad37a58d6c1fffed008bf0531b28c6a040ad5e7b5c6215c40945c632adcdca44`
`font_01_sfnt_off0000fcc4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCC4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000114db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114DB	10760 bytes
SHA-256: `b7b908ced8f4472bdd54b0a169108c22337647a2c0e8c4f72d8ac024bd85b159`

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