PDF malware analysis — malicious · 2d9a13e7a6ec4e27

MALICIOUS

PDF

91.4 KB Created: 2021-07-18 12:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 75f0a7d4d6f2aaedde2d673b6c8d6816 SHA-1: 2980068fe97f0da79d01ea415aafb9182dbd9454 SHA-256: 2d9a13e7a6ec4e27f3cb85618c8419739b6b481105a2512390686a6a1677d1f1

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs, many of which point to compromised WordPress sites hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9746

Heuristics 5

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://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e328a70e3b---71678293270.pdf In PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3188d12d0bd8d79a7a246e948aa9dc35/53308561572.pdfIn PDF document text
- https://actaviaserica.org/board/file/files/49593987798.pdfIn PDF document text
- https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5cde7215a---90415827372.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/db946bc53489de3c0c1a48f530f98bfc/52297817035.pdfIn PDF document text
- https://leuphuotcamap.com/uploads/image/files/10800024814.pdfIn PDF document text
- http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/movajat.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdb36cb91c---pikubotagepizanizokes.pdfIn PDF document text
- http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093b643d3364---goxuxasofopadozenabe.pdfIn PDF document text
- http://www.injamal.es/nueva/ckfinder/userfiles/files/mugifegowopowibibuk.pdfIn PDF document text
- http://kaitosushisb.com/uploads/files/44731132686.pdfIn PDF document text
- http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160755575b1fdb---xavafamururezolun.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5c4326cfa---tasenudolinuvawi.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607941959712a---40485446454.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e9ffdbf02---kafesaz.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac03d69a78a---2046796205.pdfIn PDF document text
- https://alcoquimicos.com/ckfinder/userfiles/files/87263626576.pdfIn PDF document text
- http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4281553f51---fewesetivezupexowom.pdfIn PDF document text
- http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c322f23c43e---raturemo.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06c082da16e76726f22e0581252fec23/gefodugikavelikanawuk.pdfIn PDF document text
- http://tunglamgarden.com/images/fck/file/75108388844.pdfIn PDF document text
- https://arket.io/wp-content/plugins/super-forms/uploads/php/files/o43ndm9pqbq37mftdcejkookb1/vezinegevajima.pdfIn PDF document text
- https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3eff407d6c5efc61233c2ddd7a774954/14922060806.pdfIn PDF document text
- http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081b73a37883---98198390337.pdfIn PDF document text
- https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/dbb3be5c7ffbda81da24dc5dd750db7b/lurulepewevumepidu.pdfIn PDF document text
- http://djarkitek.com/temp/vinney/HTML/userfiles/file/nepusopinudinexazedew.pdfIn PDF document text
- http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a37cc002d03---89016256526.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=some+applications+of+trigonometry+class+10+notesPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e7ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7AC	18084 bytes
SHA-256: `f45fc28ea8cddf9c4de70b968c46450696d545a0a295374fae13552f78d47b5c`
`font_01_sfnt_off00011745.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11745	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012f5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F5C	11188 bytes
SHA-256: `423fc49ca3beb22291d5fcdba122bdec877469ab03dacf0e6e651da98418f6f9`
`font_03_sfnt_off0001498c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1498C	16244 bytes
SHA-256: `b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647`

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