PDF malware analysis — malicious · f205b41f9c9d1948

MALICIOUS

PDF

77.3 KB Created: 2021-08-27 09:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 60d1f4d28f9ed5413cc0cba062cf5777 SHA-1: 07fc43619c75499c4c18c13cb634e06596ced349 SHA-256: f205b41f9c9d1948ae92520f5efe6a0004cbb3f0356f850169a11c72945948e0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal that the document contains a link farm with numerous external URIs, many hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the link farm heuristics strongly indicate a malicious intent to redirect users to external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9945

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 https://garglob.ru/uplcv?utm_term=my+heart%27s+a+stereo+1+hour PDF link annotation
- http://daiquangsico.com/img_duhoc/files/78707004318.pdfIn PDF document text
- http://dansensvenner.dk/imagesfile///vokekexoroxilemovoseles.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824806f2df4---sizevibuwir.pdfIn PDF document text
- http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882a9a4f6bf---78697175603.pdfIn PDF document text
- https://steklo-shik.ru/userfiles/file/97428783910.pdfIn PDF document text
- http://amirafouad.com/uploaded_files/file/tuvenodipusuwij.pdfIn PDF document text
- http://massarentearchitettura.com/userfiles/files/vedur.pdfIn PDF document text
- http://blissrenewbeauty.com/newerac2c/userfiles/file/bapiwujugugedosakaxulo.pdfIn PDF document text
- https://hotelindigha.com/FCKeditor/file/tulepilam.pdfIn PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160fee1fcadd35---ranetujajaxujebakev.pdfIn PDF document text
- https://protradingindia.net/userfiles/file/5156397801.pdfIn PDF document text
- http://blueview.nl/app/webroot/files/userfiles/files/97059254761.pdfIn PDF document text
- http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e667b10f961---5849695498.pdfIn PDF document text
- http://fipjp.com/userfiles/file/wujupaxavubadewuwate.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a55dde49bd8---81830335060.pdfIn PDF document text
- https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2b55a4c7be9f3327395731c43e515acc/27892104892.pdfIn PDF document text
- http://universalgroupautos.com/files/others/kiwifeleravabupinubaw.pdfIn PDF document text
- https://isleo.com/i_photos/file/wukewup.pdfIn PDF document text
- https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/5040c1486e1d243e3a6322e63d72d602/posinevalafarebej.pdfIn PDF document text
- http://ceraunavoltapizzeria.it/userfiles/files/71255428789.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/16660015cc296559f92c1a1b4484f006/95178755967.pdfIn PDF document text
- http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6d224115---lubunikanafabinidozeba.pdfIn PDF document text
- https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/39836557001.pdfIn PDF document text
- http://topstec.com/d/files/poxafosamun.pdfIn PDF document text
- http://fairway.cc/images/blog//file/17814221491.pdfIn PDF document text
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_006_off00010de3.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x10DE3	17092 bytes
SHA-256: `a93a328484fed4c3543885a2c897315a2e29db0ddeb49102bd9180df4aa2ae81`
`font_00_sfnt_off0000b70f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB70F	15368 bytes
SHA-256: `0d7693ec90f84fcee7347b04d6e77780a634e0fa6aac922542ab63a226f547e4`
`font_01_sfnt_off0000de73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE73	10256 bytes
SHA-256: `dcf4eb9b8ae007ee8d2896bae9c0f84602be6d8c4da7a76e2f61dd49e1b6e4d3`
`font_02_sfnt_off0000f5d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5D2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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