PDF malware analysis — malicious · 4e880ce5dc731b8d

MALICIOUS

PDF

73.8 KB Created: 2021-09-04 23:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 73717af3ed5b37fee00830d84516f938 SHA-1: 543f610e497316a99638323c976b31aaa2df5b75 SHA-256: 4e880ce5dc731b8da41e5fe7a4bfab41473c364c4977cc0ce51e5c2512ec1201

136 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various compromised WordPress sites, likely intended to host or redirect to malicious payloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document's purpose is to trick the user into believing they need a password for an archive or attachment, a common tactic to bypass gateway security and deliver a secondary stage. No scripts were extracted, but the overall structure suggests a downloader or droppper functionality.

Machine Learning

Nyx PDF Classifier malicious score 0.9885

Heuristics 6

Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608afe47d0b9f---2632966448.pdf In PDF document text
- http://andlupa.com/userfiles/file/muvaniwevamuwazosur.pdfIn PDF document text
- https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c3902a00ea5---lovuwexapefiwamakafovukut.pdfIn PDF document text
- https://elsa-daulte.com/ckfinder/userfiles/files/26078629852.pdfIn PDF document text
- https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/73099589974.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/fca0125c22fe056939115e066c87dda2/pojip.pdfIn PDF document text
- http://bioaec.com/userfiles/files/bisimopixux.pdfIn PDF document text
- http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36b77c003---30727186919.pdfIn PDF document text
- http://vanlysecurity.vn/vanly/album/files/83654807515.pdfIn PDF document text
- http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b88c885910---momuxeded.pdfIn PDF document text
- http://noithatachau.vn/webroot/img/files/39756223603.pdfIn PDF document text
- https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/6chgh57d9u1c3p3lcti06m7lvl/vubugavijerorulul.pdfIn PDF document text
- https://akrmedia.no/ckfinder/userfiles/files/dolekemebiwikazaz.pdfIn PDF document text
- https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/dd16e62b706aefad3ccf579436172ac5/4525722470.pdfIn PDF document text
- http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/6643941856.pdfIn PDF document text
- http://bachova-terapia.sk/images/file/38195181794.pdfIn PDF document text
- http://cdkkck.com/uploadfile/file/20210531032653.pdfIn PDF document text
- http://cloverdiamond.com/file/88410655088.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081b671f12ea---22244358988.pdfIn PDF document text
- http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d956ec55747---xevogivemexasezafofi.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8dadc8ca2---wifakenavivogijawe.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e191d0d19e172c211bbe6a29b1451654/dikisumun.pdfIn PDF document text
- https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/ec5aa5ce0e50712743c799cf38ef898b/muriwite.pdfIn PDF document text
- https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/tuh3eu51tn57ho7se70c2ik9bg/gepurulinuto.pdfIn PDF document text
- http://cabanagarden.hu/editor_up/45775552252.pdfIn PDF document text
- https://used-machinetools.ro/app/webroot/files/userfiles/files/99586548597.pdfIn PDF document text
- http://grandfiltr.com/files/file/10381475109.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cpwd+manual+2019+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_off0000bd98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBD98	16860 bytes
SHA-256: `f81baec16badf24302e55d3716e9a49218bd49c76b1bdfc4f920c568119b108d`
`font_01_sfnt_off0000e919.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE919	10628 bytes
SHA-256: `215891f0426a75609e82487c5ac24eae429ee27af6ab8c53e9b7127d9b2e1872`
`font_02_sfnt_off00010186.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10186	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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