PDF malware analysis — malicious · 286d4c0a0c50e9b3

MALICIOUS

PDF

84.8 KB Created: 2021-08-20 22:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: acb67df01f958fb6a303ffe02ab11589 SHA-1: e71cbb09600fe0f30016376522bf1a31d2345a1e SHA-256: 286d4c0a0c50e9b366e03c42b0a6eaeebbe3a589bb95e7f0719fb654212fbd38

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by an ML classifier. It contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations. The 'utm_term' parameter in one of the URLs suggests potential SEO manipulation or traffic redirection tactics. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly indicate a malicious link distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://infrive.ru/uplcv?utm_term=sopa+de+letras+para+ni%C3%B1os+en+espa%C3%B1ol+para+imprimir PDF link annotation
- http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae292e379ed---58478541835.pdfIn PDF document text
- https://komunalno-vrgorac.hr/files/mepitexulozunusodapin.pdfIn PDF document text
- http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gigoteb.pdfIn PDF document text
- https://hondamienbac.vn/userfiles/file/81991351761.pdfIn PDF document text
- https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/b01b8feb2e40443728a3e9f0b7d58d20/sarigazejogitofuli.pdfIn PDF document text
- https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0e4b66cac6acd61392f5ea2f35d79f8c/151521816.pdfIn PDF document text
- http://plncse.hu/php_data/file/51195085760.pdfIn PDF document text
- https://blugarden.eu/file/zebapamutenimawax.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca17dd0bc6---lulilunopor.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f0gjvsp1b1tdu18fhb4r3i0i40/gidup.pdfIn PDF document text
- http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1e75290c---mibol.pdfIn PDF document text
- http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a010ede9a9---4934667194.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/87105b321f594730eac564e4d72392c9/77986234947.pdfIn PDF document text
- http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160becb5e95310---67208335761.pdfIn PDF document text
- http://mispuntossaga.com/campannas/file/32575529454.pdfIn PDF document text
- http://broadgatecapital.com/userfiles/file/rubaxelometami.pdfIn PDF document text
- http://theartofdesign.nl/ckfinder/userfiles/files/30055495552.pdfIn PDF document text
- http://provia-events.de/pics/fotos/1/file/96035584658.pdfIn PDF document text
- https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/24b884a29e2c95a852eb1530419e555d/votupotogugugonijowusemat.pdfIn PDF document text
- http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081ffed88236---79794028122.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/edf94034838ad6afc3760f083cce2b8c/vawefedewubuxukatobopeko.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ff75257ce---63825293970.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907c91195c6---tolosuvadizole.pdfIn PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffc4867a8b---93244850586.pdfIn PDF document text
- https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a15b6cd21cfa32bca53596d3c88f0d41/93099075528.pdfIn PDF document text
- http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/947cb7cee456a828a0ed6109bc4f49a7/81464785493.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_off0000e2ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2EC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fafe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAFE	18224 bytes
SHA-256: `fb4008d11d7dc86599dbd33d4355a4c72ed18a2b22bb9e719beabea2eb3bf933`
`font_02_sfnt_off000128d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128D5	10836 bytes
SHA-256: `813a874c1246891dce2158ae15367303e22b7324e83936d2965c6e131f90299b`

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