PDF malware analysis — malicious · 1d230bf65d418705

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 00:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: e3abd6d35efe515c97e35de11f7743e5 SHA-1: 22bb37ac8ee69dec3579e4e2a49ccb68958ed7af SHA-256: 1d230bf65d41870503d80686619347356e891820e3dd6ca3480496c23b0ffcb3

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely initiates a redirect to one of the listed URLs, which are part of a link farm designed to obscure the ultimate destination, likely a phishing page or malware download site.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

Heuristics 6

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://irlanc.ru/uplcv?utm_term=partitive+proportion+worksheets PDF link annotation
- https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607872a538e6d---9712459152.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a052352f21a---64247368449.pdfIn PDF document text
- http://boathousebrokerage.com/userfiles/file/14649412193.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fed340477---6989424874.pdfIn PDF document text
- https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609247deddc84---sidekilavelevena.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lua5rbsn44ahcvghs0ftk081f6/momejidobab.pdfIn PDF document text
- http://hanauhrova.cz/files/kuweguperavasegamozes.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608824c0e55c5---vuzumuveji.pdfIn PDF document text
- https://jiu-hang.com/upfiles/editor/files/zatuluxopaf.pdfIn PDF document text
- http://qqsbg.net/uploads/file/dokugejuguxeluvexus.pdfIn PDF document text
- http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/16262872353.pdfIn PDF document text
- https://rugsdirect4u.com/uploadedfiles/file/nibizafo.pdfIn PDF document text
- http://macautemple.com/userfiles/file/44407427668.pdfIn PDF document text
- http://bioterapiazabiegi.pl/obrazy/file/pomoxetegatavavaloj.pdfIn PDF document text
- https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/09o0b974jcbsamigncius645sr/66054935050.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acfef6a216f---4499348384.pdfIn PDF document text
- https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/e6feb6d74a9f6401975ea5393db9d28d/febugizutotuxakajexewu.pdfIn PDF document text
- http://ubestsports.com/imager/files/20210701205435.pdfIn PDF document text
- https://dalton-english.com/userfiles/file/16533587442.pdfIn PDF document text
- http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/8972738213.pdfIn PDF document text
- http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/16991904154.pdfIn PDF document text
- http://vytvarnyobchod.cz/UserFiles/File/xadubozavamiri.pdfIn PDF document text
- https://padservhosting.com/userfiles/file/vijajegekemabemumupadedot.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/5tbg0qsc6f88615vp2qmoqahcp/84372678840.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_off0000c822.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC822	18980 bytes
SHA-256: `5a45fbf8fc556a7f8a45de14e0a921bbfa117ad31d41e4bf87421f402cc45c5f`
`font_01_sfnt_off0000f870.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF870	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011087.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11087	10548 bytes
SHA-256: `c522cb9fe273e1cf0bafceb6888b6589f69eb9bd7d8593322efbec09c810314b`

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