PDF malware analysis — malicious · a7ad2f811f205774

MALICIOUS

PDF

86.0 KB Created: 2021-07-04 06:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: ef61cdf791c3d9f0c755d11c79225e7b SHA-1: 24b32927849038e244925d3d13eaa043eca241c5 SHA-256: a7ad2f811f20577460db1cf7b6b5e47fdf2ca7421d8e08fba4039e68e2b9c86e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to various websites, many of which appear to be compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous external links suggests the primary attack vector is directing users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 https://ketchas.ru/uplcv?utm_term=special+projects+coordinator PDF link annotation
- https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abda35c2cec---metofivobefuxaxe.pdfIn PDF document text
- http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddcc69238c---97772524846.pdfIn PDF document text
- http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc79b7f256f---50522060687.pdfIn PDF document text
- http://anhopphat.com/uploads/files/jigojofoseture.pdfIn PDF document text
- http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160872633dc797---lotovale.pdfIn PDF document text
- https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1dfcc77525b1daa77689afe1de7186c4/9138185673.pdfIn PDF document text
- http://fittbike.hu/files/file/wozibofuteva.pdfIn PDF document text
- https://balajitutorial.com/admin/userfiles/file/51036614911.pdfIn PDF document text
- http://architettogherardi.eu/userfiles/files/munosin.pdfIn PDF document text
- http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43edeb00b---dunitowajuga.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a468658ae---gozamuvut.pdfIn PDF document text
- http://didaconcept.com/admin/fckeditor/file/desobaxojo.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4i3ts6v25dull6i61m1hcukkir/jigivipajig.pdfIn PDF document text
- http://aranykoronakft.hu/userfiles/file/roxiwoxisanilaxafor.pdfIn PDF document text
- https://detectiveoffice.net/userfiles/file/dojebuvodaga.pdfIn PDF document text
- https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc4a3dadfc---86190114815.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b072d09ca---43884831410.pdfIn PDF document text
- http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/30228253860.pdfIn PDF document text
- https://kudamatsu.org/userfiles/file/12432763472.pdfIn PDF document text
- https://bluetact.com/ckfinder/userfiles/files/fototitafofupotox.pdfIn PDF document text
- http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072c61b36149---71367749441.pdfIn PDF document text
- https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/9grna4tf8uua8aa1flljoa05ag/suwotavokafexakagigibepe.pdfIn PDF document text
- https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c27ef81132285a11d0464341e1ca72b5/34323606727.pdfIn PDF document text
- https://taperagi.com/contents//files/mumodemevikegurovidev.pdfIn PDF document text
- https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/oko55kkthged00i4s23sc0m8c6/55143994050.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c26fd4adba4a9387b74c64da73dd41c/sijiv.pdfIn PDF document text
- https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/85f786ec19f7af8becdbb9882e4450ad/33073606967.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ea81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA81	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010293.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10293	18212 bytes
SHA-256: `10c8c9fb8feb55dceedca2a893d6b6f8780c50fef264ec3ad4cfc198128347dc`
`font_02_sfnt_off000131f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131F7	10712 bytes
SHA-256: `c83b6a9e52ff5b635602e5c09965a664f274ea58e2e7eb42ef72658053c5023d`

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